Warning: Geek humor ahead.
There are two guys who go to our church who hadn't met each other until a Men's Breakfast last weekend, when they were seated across from each other.
"I don't think we've actually met," J said to C. They introduced themselves, and shook hands.
"Actually," one of the other men pointed out, "C works for Apple, and J works for Microsoft."
"Oh...." C said. He smiled as he took the hand he'd just used in the handshake, and pointedly wiped it off on his shirt, as if to wipe off the germs.
"Oh, don't worry, C!" The Engineer assured him. "You can't possibly catch any virus J would have."