The Doctor : Don’t worry Reinette, it’s just a nightmare. Everyone has nightmares; even big scary monsters from under the bed have nightmares, don’t you, monster?
Reinette : What do monsters have nightmares about?
The Doctor : Me! Ha!
Tenth Doctor - From Doctor Who S02 E04 [The Girl in the Fireplace]

 

The Doctor : Didn’t anyone ever tell you? There’s one thing you never put in a trap if you’re smart. If you value your continued existence, if you have any plans about seeing tomorrow, there’s one thing you never, ever put in a trap.
Angel Bob : And what would that be, sir?
The Doctor : Me.
Eleventh Doctor - From Doctor Who S05 E04 [The Time of Angels]