"Twisted Like A Corkscrew" joke

Al and Don were standing at the urinals in a public bathroom, when Al looked over and noticed that Don's penis was twisted like a corkscrew.
"Wow," Al said. "I've never seen one like that before."
"What do you mean?" Don asked. "Like what?"
"All twisted like a pig's tail," Al said.
"Well, what is yours like?" asked Don.
"It's straight, like normal," Al replied.
"Geez, I thought mine was normal until I saw yours," Don said.
Al finished what he was doing and started to give his member a shake before putting it back in his pants.
"What did you do that for?" asked Don.
"To shake off the excess drops," explained Al. "Like normal."
"Shit!" exclaimed Don. "All these years I've been wringing it!"