A clown walks into a bar.
The bartender says "We don't serve clowns here."
The clown says "I'm not really a clown, I'm dressing up as one for a hallowe'en party later tonight."
The bartender says "Hallowe'en isn't until next week."
"Yes, but it's an early party."
"All right, you can stay. Just don't do anything clownish."
Minutes later a second clown walks into the bar.
The bartender says "Hey, no clowns."
The clown says "I'm not a clown. I'm dressing as a clown for the party later tonight."
"So there is a party?"
"Yes. It's just down the street. You should join us."
The bartender thought about this and decided he needed to watch bar for the night so he couldn't make it. "Maybe next time," he said.
A third clown comes in.
"Are you going to the party?" the bartender asks.
"No, I'm a clown."
"I'm sorry, but we don't serve clowns here."
The clown whispered in the bartender's ear for a few moments.
The bartender says "Okay, you can stay."
In a few moments, the third clown went to the bathroom. One of the other two leaned over to the bartender and said "What did he say?"