Blew Chunks

A man walks into a bar and asks the bartender for a case of beer, any kind except Schlitz.
The bartender says :
- What's wrong with Schlitz, don't you like it ?
The man says :
- I hate that shit. Last night I drank a whole case of Schlitz and blew chunks.
The bartender says :
- You drink a case of any beer you're going to blow chunks.
- You don't understand; says the man, Chunks is my dog.