An imposter among us

Having just helped defeat the Doctor's evil doppelganger Ramon Salamander, Jamie reunites with what appears to be the Doctor and brings him into the TARDIS. However, when Jamie and Victoria ask the Doctor to take off, the latter silently asks Jamie to do it instead... which puzzles Jamie, because the Doctor usually doesn't let him or Victoria touch the controls. His suspicions are confirmed when the real Doctor shows up, revealing that the man at the console is actually Salamander.

Example of:
Out-of-Character Alert