If I start to drink too much, just pull off my lips.
Sometimes people request that their friends watch how much they have had to drink, and to stop them if they are drinking too much. Here, the Mr. Potato Head toy makes this request, but informs the person that he should simply pull his lips off his body if he over-consumes alcohol. This is funny because on the Mr. Potato Head toy, it's possible to remove his ears, eyes, arms, etc.