Swinging a watch (or round object in general) in front of someone to hypnotize them.
- Watch the swinging watch. Now, when I count to three, you will visit the unabridged version. One... two... THREE!
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/HypnoPendulum
FollowingLaconic / Hypno Pendulum
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