Funny / Metal Slug

• The sheer silliness of the animations, machines and situations is bound to make one smile...which you should enjoy while it lasts. Even the tower defense spinoffs got their own pages which are chock full of Super Sentai references.
• The good ending of Metal Slug 4, in which the team has a feast and eats themselves to fattiness. Even the bad ending lightens the mood. The player or players are visited in hospital by the other playable characters who bring in baskets of fruit. They give a huge smile upon seeing it.
• In Mission 3 of the first game you get to blow up a portable lavatory with a soldier inside. He does a massive Oh, Crap! and flushes himself down the toilet bowl in panic.
• The ending of the second game, when the table Morden is strapped to falls over, with Morden still on it, his soldiers whimper upon seeing that and only then your character celebrates the end of the level.
• The second announcer from X-5 is all known for his hamminess when it comes to announcing the weapons you've picked up.
  HEVVY MASHEEN GUN!
  RAWKET LAWNCHAIR!
  MOBEEL SATTELITE!
  SHAWTGUN!
  YOU'RE GREAT!
  (clickclick) STONE!
• Riding one of the animal Slugs. You get some pretty awesome combat machines, but you can also ride camels, ostriches and elephants, all equipped with the trademark gatling gun.
• Rescuing Hyakutaro Ichimonji. You expect him to be a regular prisoner rewarding you with a powerup...but instead he accompanies you and starts shooting homing hadokens.
• In Metal Slug 2/X and 3, the Mummy Generators basically resemble a sandstone phone booth. That's not the funny part, the funny part is that there's a huge blue sign with the text "MUMMY" on top of it instead of some ancient Egyptian inscription.
• MS 2 Mission 8 upon defeat the machinegunner falls into the sea and is swallowed whole by an orca that comes out of nowhere. It even spits out his bones.
• The Samurai/Japanese Soldiers in Metal Slug 3.
  • Due to running out of resources, they have to improvise. Among the things they use are a tank◊ carried by two Japanese soldiers and aircraft that "fly" via a rope and pulley system.
  • For extra hilarity, they went through all the trouble creating the pulley system but didn't take into account that they'd run out of space for the airplanes to "fly". The result is a bunch of pulley-airplanes crashing and blowing up into the wall because they didn't think the whole design through.
• A common group of enemies in the series is a group of Masknells who fly in sync to follow the leader (the red Masknell). Destroying the lead Masknell first will cause a chain reaction where the rest explodes all by themselves just to follow the leader.
• Hard to pull off, but if timed right, you can make the surrendering Abul Abbas explode (X only).
• Whenever you die, whatever soldiers are around will point and laugh...only to scream and bolt the hell out of there when you respawn.
• In stage 3 of Metal Slug, after destroying an outhouse, you find a Rebel soldier on the can. He takes a second to panic, then flushes himself down the toilet to get away.
• Metal Slug 3 Mission 5.
  • After seemingly defeating Morden near the end of 3, it's revealed that he's an impostor and the real one was shackled to a Dai-Manji. When the current player character is abducted and screams, Morden opens his mouth in an animation as if he's screaming too, except there's no voice clip of him doing so. If the abducted character is female, it looks like Morden's scream is hilariously high-pitched.
  • Play the game with 2-Players and defeat Morden together, one may think that the Martians may decided to take away the two, but, for some bizarre reason, they only take one while leaving the other completely alone. For extra hilarity, the second player will simply stand around and do nothing, even more-so if they decide on Going Through the Motions: the males (Marco and Tarma) will either drink water from a flask, or take a nap (or as Tarma, check on his snack, only to find it empty, crush it, and throw it away), Fio will set-down a picnic blanket and grab a bite, while Eri will simply grab a bubble gum and blow a bubble out of it, in the middle of their companion's abduction.
• One hostage type is a high-ranking businessman in a nice suit. On rescuing him, he calls in two bodyguards with suitcases that spit out items, then they all vanish... usually. Sometimes, the bodyguards will vanish and leave behind the businessman, who looks around, confused. After a couple seconds, one of the bodyguards comes back with a sheepish grin before grabbing the businessman and leaving with him.
• Due to Artificial Stupidity or other quirks, enemies can accidentally hurt or kill their own allies (or themselves) with certain attacks and weapons and, if you simply hang back and watch the chaos, it becomes a form of comedy gold that would make them a candidate for Darwin Awards. See here.