A man walked up to a farmer as he came out of a voting booth, "I'm
from the FBI."
"What seems to be the trouble?"
"We happen to know that you accepted a bribe and sold your vote."
"That's not true. I voted for the candidate because I like him."
"Well, that's where we've got you. We have concrete evidence you
accepted $50 from him."
"Well, it's plain common sense. If someone gives you $50, you're
going to like him."