go ahead, make my day
1. Just try to do me harm or disobey me. I will enjoy punishing you. (From a phrase said in a movie where the person saying the phrase is holding a gun on a villain and would really like the villain to do something that would justify firing the gun. Compare this with Keep it up!) The crook reached into his jacket for his wallet. The cop, thinking the crook was about to draw a gun, said, "Go ahead, make my day!" As Bill pulled back his clenched fist to strike Tom, who is much bigger and stronger than Bill, Tom said, "Make my day!"
2. Go ahead, ruin my day!; Go ahead, give me the bad news. (A sarcastic version of {1}.) Tom (standing in the doorway): Hello, I'm with the Internal Revenue Service. Could I come in? Mary: Go ahead, make my day! Sally: I've got some bad news for you. John: Go ahead, make my day!