When Gwen and her mother argue about magic. While Aggie zaps the fried chicken into a live one.
Aggie Cromwell: Leftovers, when you should know that chicken tastes better when it's back on the bone.
Benny the cabby guy often has a pun or two to spare. In the first film, he has the voice of Rino Romano, so it's even funnier.
The scene when Marnie compares herself and her siblings to coach-potato's.
Gwen: I'm just trying to protect you.
Marnie: Yeah, you're protecting us from being anything but a bunch of vegetables. (sits down) Hey look! I'm a potato, are you happy now? Maybe I'll put down some roots in the carpet. (mockingly) Oh no Marie, it's too dangerous! There're things about vegetables that YOU don't understand.
In the third movie, Marnie gets annoyed with Dylan and magically sticks him to the ceiling. The next morning, he has a crick in his neck. When asked if he's all right, he gives the following response: