Humans suck  Tags: other, randomthought, webdevelopment, real life.
Lately I've been working on two 'private' projects. Both failed due to human imprecision.

Firstly, I thought of something which might identify which song is playing in your head. You can't play it back (Shazam won't work), and most people don't want to sing it in front of the microphone on websites like Midomi. My system would recognise the tap pattern from a song. You'd drum your fingers on the desk or whereever, and it was supposed to search in all records for one that matches your drumming pattern.
Before I really got far with it, I discovered the drumming pattern was too variable to ever work.