"Hey, wanna play a game?"

A blonde and a lawyer find themselves sitting next to each other on airplane. As take-off begins the lawyer already finds himself getting bored, and so he turns to the blonde and says "Hey, wanna play a game?" Slightly interested, the blonde turns back to him and says "What is it?"

"Well, the way it works is that if I ask you a question and you don't know the answer to it you pay me 5 dollars. But if you ask me a question and I don't know the answer I'll pay YOU 5 dollars."

"Nope, not interested."

"Okay hang on," says the lawyer, confident in his intelligence. "Tell you what, if you ask me a question and I can't answer it I'll give you a hundred dollars instead. How does that sound?"

Now much more interested the blonde nods agreeably.

"First question," says the lawyer. "What is the chemical symbol of gold?"

The blonde wracks her brains but just can't remember and hands him five dollars.

"My turn!" she says. "What has silver and red stripes with 16 legs and wings?"

The lawyer's quite confused by this, but he desperately tries to think of all the zoology he knows. He even makes surreptitious google searches on his phone. But try as he might he still can't find the answer. Finally he gives up and hands the blonde a hundred dollar bill. "But I have to know," he asks, "what was the answer to your question?"

Without a word the blonde slips him another five dollars.