This guy was having a drink in a bar. It didn't escape his notice that the bartender was a very sexy lady.
She came over to chat for a bit and he said,
"I bet I can keep an eye on this drink while I go to the bathroom," as he lay a $10 bill on the bar.

She knew the bathroom was around the corner and accepted his bet. He removed his glass eye and took off to the john.
"Very funny," she said when he returned.

He smiled and said,
"Ok, look, let's try another one." Again, a $10 bill goes down on the table.
"I'll bet you I can bite my own ear."

She matches the $10 and watches unbelievingly as the guy removes his false teeth and clamps them down on his ear.

He grins and said,
"All right, one more bet. A chance to win your money back. I bet I can make love to you so tenderly that you won't feel a thing."

Thinking this was something she knew about, she took him by the hand out back behind the bar and lifted her skirt. They went to town. A few moments later she giggled,
"I can feel you."

He kept on pumping and said,
"Well, win some, lose some!"