What is hidden in 3D image?

The new guy in town decided to take a few minutes and head down to the local pub to try to meet some people. He stumbled in at about 7 PM and sat down at the bar to order his first drink.

One of the regulars sitting at the pool table got up and came over to start up a conversation. He says, "hey, I bet you 5 dollars I can lick my eye". The new guy was a little put-off by this introduction, but it was early in the evening so he took the bet. Sure enough, the regular had a glass eye, popped it out, licked it, and put in place.

A funny enough parlor joke, he handed the man 5 dollars and went back to drinking. A few minutes later he returned, this time saying "I bet you 5 dollars I can touch my elbow to the back of my head." Desparate for any attention, the new guy handed over another 5 dollars and watched as the regular popped his shoulder out of joint and touched the back of his head.

Deciding he had already duped the new guy out of $10, the regular headed back over the pool table for the next few hours. As the bartender began to close up shop, he returned for one last wager. "hey, I bet you $100 I can piss on the celing". The new guy looked up at the vaulted ceiling which was eaily 30 feet above and was convince he would soon win his money back and a nights worth of drinking.

The regular pulled it out but didnt even come close, pissing on the bar and the local guy. "Ha! I won all my money back! That was a stupid bet!"

The regular retorted, "yeah, but I bet the guys over there $500 I could piss on you and make you laugh!"