A lecture about English
A linguistics professor was lecturing to his English class one day. "In English," he said, "A double negative forms a positive. In some languages, though, such as Russian, a double negative is still a negative. However, there is no language wherein a double positive can form a negative."

A voice from the back of the room piped up, "Yeah, right."

Can't chance it!
A guy goes on vacation to the Holy Land with his wife and mother-in-law. Halfway through their trip, the mother-in-law dies.

So the guy goes to an undertaker, who explains that they can ship the body home, but it'll cost $5,000 or they can bury her in the Holy Land for $150.

"We'll ship her home," says the son-in-law.

"Are you sure?" asks the undertaker. "That's an awfully big expense and I can assure you that we do a very nice burial here."

"Look," says the son-in-law, "two thousand years ago they buried a guy here, and three days later he rose from the dead. I just can't take that chance."