A guy is at the bar, just staring at his drink, when a big truck driver steps up next to him, takes the guy's drink, and gulps it down.

The guy starts crying.

The truck driver says,
"Come on, man, I was just fucking around. Here, I'll buy you another drink. For Christ sakes, don't cry."

The guy says,
"You don't understand. This has been the worst day of my life. First, I sleep late, and when I get to my office, my boss fires me. When I get to the parking lot, I find out my car is stolen. I get a cab home, and when I get there, I remember I left my wallet and credit cards in my desk at work. The cab driver doesn't believe me, and kicks my ass. When I finally go in the house, I find my wife in bed with the gardener. So I come to this bar, and just when I'm thinking about ending it all, you show up and drink my poison."