Not sure if it would ever appear among YC apps, but you could probably make a very appealing submission by devising a way to give eye massages from the computer monitor. :)
Actually, I'm back to propose this very system. Takers welcomed! Or suggest your improvement.
Load YC apps into document reader. Put a timer in the page, and capture onclicks, onkeypresses, and onscrolls. Compute "stress level." When stress level high, dim screen, start swirling through various soft colors and natural scenery, and play embed sound file (in sexy voice of your choice):
"Close your eyes. Relax. You are happy. Your limbs, they feel deep, and tired. You're in a beach, the breez... zzz... zzz"
Detect snoring sound. Play sponsored embed sound file (in sexy voice of sponsors choice):
"You want to buy this. Now."
