A psychologist pulls habits out of rats!
The Holocaust was funny.
A disposable camera doesn't have to reload 3 times to take 30 shots.
In all 3 cases, someone forgot to pull it out.
When the leash goes slack.
Miss Direction.
When you get there, you turn into the driveway. Ba-dum-bum! Don't forget to tip your waitress!
He Freudian slipped.
Just one, but first the tire really has to want to change.
Who cares? It's a relephant.
Two, but you have to get them in the lightbulb first.
Force of habit.