The only one I really know is this...
A man goes into the same bar every night and orders three whiskeys, drinks them, then leaves.
After a couple of weeks of this, the bartender takes notice and decides to ask him about it. The man tells him, "One is for my father back in Ireland, one is for my brother in Boston, and one is for me." The bartender says "Oh, that's cool. Kind of like a family tradition or something?" And the guy replies, "Yeah, something like that."
Fast forward a couple of weeks later, and the bartender notices that the same guy is only ordering two whiskeys each night. Curious, he asks the man, "I noticed that lately you've only been ordering two whiskeys. Is everything okay? Was there a death in the family?" The guy replies, "Oh, no... nothing like that at all. I quit drinking."