A man walks into a bar with a monkey on his shoulder. The bartender says, "Hey, you can't have that monkey in here!"
The man replies, "Oh, don't worry, he's very well behaved. Watch this." He then reaches into his pocket and pulls out a tiny piano. The monkey starts playing beautifully, and the bartender is amazed.
Impressed, the bartender says, "That's incredible! Do you mind if I give it a try?"
The man hands the tiny piano to the bartender, and he starts playing a tune as well. Suddenly, the monkey reaches over and starts spanking the bartender on the head.
Shocked, the bartender asks, "What is he doing?!"
The man replies, "Oh, he just saw me do it once and now he's trying to tune it."