Couple of weeks ago when I was playing, my partner got all liquored up and would do shot like leading with 2-3 cards...when they weren't sure winners. I wanted to beat him to a pulp.
We call making that kind of mistake (also such as playing a trump suit card when you should have played a different suit [ex: person lead spades, you have spades, but trump it with a heart], trumping your partner when already winning the hand, or picking up a card when you don't have any of the suit in your hand etc) reneging, and it is punished by a shot of hard liquor.