According to Rikao Yanagida, described by Mainichi as "head of a think tank", the dinosaurs died out not because of an asteroid impact but because they made too much noise when they were mating.
"Even if you calculated that dinosaurs only have the same impact when thrusting as humans," Yanagida told the weekly Shukan Hoseki, "at 100 tonnes, thrusting every 6.7 seconds would create 2200 kilowatts of energy. About 50 per cent of that energy becomes noise. If dinosaurs were having sex, the noise would be tremendous. It would kill any humans within a 130-metre radius.
"What's more, omnivorous dinosaurs travelled in groups, so when they had sex the sounds they emitted would have killed off all the small dinosaurs around them. That robbed the carnivorous dinosaurs of their food, making them extinct, too."
Interesting idea, but somehow we're more convinced by the asteroid impact theory.