Hand driers.

Why is it hand driers in public lavatories only work for about eight seconds?
I mean how dry do they think your hands are going to get in that time for heavens sake?, maybe if it was the power of a tornado jet exhaust it might actually dry your hands in that time, but in the real world with all the power of an asthmatic butterfly feebly flapping it's wings eight seconds is about three minutes too short, meaning you end up drying your hands on your hanky or trousers anyway.
Here's an original idea, put paper towels in there instead, yes it'll cost you a few quid but think of the poor butterfly your saving!