One from Steve :-)

An undertaker decided to update his fleet of cars, so he had them converted via AI to self-driving.

He thought he'd better try one out before using them for real funerals, so he took it to the edge of a lake, fully expecting it to stop automatically at the edge of the water. Unfortunately, it didn't, and the poor chap was drowned.

The moral? You can take the hearse to the water but you can't make it think...