Ha gotem moment
(n) A situation in which one person is able to trick somebody is doing something they didn't want to do in the first place and then promptly laughs at them afterward.
Person 1: Hey, you remember when Ned was willing to play that game with you and then you just left after 5 minutes.
Person 2: Oh yeah, that was a real ha gotem moment.
Person 2: Oh yeah, that was a real ha gotem moment.