Also can be in the form of 'Don't CATCH AIDS.
His Friend: Cool, use rubber and don't get AIDS.
Ty: Going rock climbing on Saturday
His mom: K son, just don't get AIDs. *mwah* Love you.
WWII Marine Captain: Now remember men, we're completely surrounded by the enemy. Use you head or the snipers will make your you lose it. Just don't catch AIDs and we'll be home to see our families by Christmas. Clear?
His Men: 0_o
WWII Marine Captain: I said. AM I CLEAR MEN!!!!???
His Men: er....SIR YES sir!!!!?