3 totally unfounded theories:
1) Pedestrians that walk on the right side of the street perceive themselves to have enhanced right-of-way compared to those walking on the left side.
2) Increasing oil prices (and subsequent food prices) will cause overweight people to be perceived as sexy again (or would that be 'overweight people to be perceived as the body-type ideal'?)
3) Since the muscles controlling the tautness of the eardrums relax when presented with persistent loudness, the aural perils found at a raucous concert or such like event occur only when someone tries to speak to you, when you are most likely to willfully tense the eardrum in order to hear what they say. Peril!