A guy is sitting at the bar, getting really drunk. Eventually, the bartender realizes he needs to cut him off, and tells him.
"I'm not drunk!" the guy protests, "I can prove it! See that cat walking in the door? I can see he has only one eye! That proves I'm not drunk!"
The bartender just shakes his head and says, "You're even more drunk than I thought. That cat isn't coming in; he's going out."
"I'm not drunk!" the guy protests, "I can prove it! See that cat walking in the door? I can see he has only one eye! That proves I'm not drunk!"
The bartender just shakes his head and says, "You're even more drunk than I thought. That cat isn't coming in; he's going out."

