Two balloon ascensionists started out one clear day in their hot-air balloon. After an hour or two, the clouds blew in and obscured the fliers' view for a couple of hours. When the sky cleared, they were totally disoriented. Luckily, they saw a person in a field below and called down, "Where are we?"
The reply came, "In a balloon."
Whereupon, one of the balloon enthusiasts said to the other, "It's our luck to get a neurologist at a time like this."
"How do you know he's a neurologist?" the other asked.
"Easy," said the first. "His answer had two