A drunk guy at a bar asks the waiter to serve him three coffees.
-Yes, one for me, one for you and one for your mom.
The next day the same drunk guy asks the same waiter:
-Yes... three... one for me, one for you and one for your mom.
The waiter could not take it any longer, jumped over the table and beat the drunkard. A day later, the guy comes full of bruises at the bar. The waiter asks him ironically:
-No, replied the drunkard, only two: one for me and one for your mom. For you, no! I noticed it makes you nervous.