don't do anything I wouldn't do

cliché Don't do anything reckless or foolish; behave yourself. Usually used humorously or lightheartedly. A: "OK, Dad, Tom and I are heading off to the camp site. See you on Sunday!" B: "Have fun! Don't do anything I wouldn't do!" A: "Don't do anything I wouldn't do!" B: "Coming from a goody-goody like you, that really doesn't leave us much." Please be careful at this concert, OK? Don't take drinks from strangers and don't get in the mosh pit. Basically, don't do anything I wouldn't do.