Are there any good April Fools jokes today? For example, a few years ago Google announced a sewage based ISP (i.e. flush some fiber optic cable down the toilet and they would fish it out and connect it).
The only one I have come across is IGN article about the Nintendo Virtual Boy Pro.
If left on, those things can scratch the paint. Dirt from the road works its way in. I had a friend who destroyed the paint job on his car with one. He had it on a pretty long time tho.