When parents tell their little kids to not get in trouble or they won't get any fucking presents for x-mas.
m: Bobby, if you kill your sister, Santa Claus won't give you anything for Christmas!!
Bobby: Oh yeah. I want a double bladed axe for x-mas so i'll just have to wait till after.
when you are punched you go "OUUUUGHHH", this is a shortened version, can be heard on the OOF keyboard.
Bad guy on oof piano: OOF OOF, OOF OOF OOF OOF OOF OOF-OOF, OOF, OOF...