We used a nav system a couple of years ago. It was quite handy. When we got to our destination, however, we stopped using it for navigation and started using it for entertainment.
How, you ask?
Well, we would program a street we had just passed into the thing, then listened to it as it kept telling us we were "going the wrong way."
"Please make a legal U-Turn at the next available intersection."
We just wanted to piss it off. We imagined a cartoonish end to our Navi-Friend... it would start to shake and smoke incessantly, then start shouting,"Turn around, Dumbass! You're going the wrong way! Why the hell don't you listen to me! Goddammit!"
and then it would burst into flames.
It don't take much to entertain the Critterites. :-D
Peace,
Amy