Haha. That binary joke is sooo old...(you know it's old when thinkgeek makes a shirt about it

)
It's not the best...but the only I could think of:
Three men met at a party, and it wasn't long until the conversation
got around to their line of work and what kind of cars they drove.
"I own a sign company," the first man said. "So naturally, I have a purple Neon."
The other two men nodded.
"I'm a veterinarian," said the second fellow. "I have a white `Vet."
The third guy was quiet for a minute.
"Well," he finally said, "I'm a proctologist. I have a brown Probe."
Sorry
