The rolling shutter used by the majority of consumer CMOS sensors can do crazy things to photos and videos. The video above shows what an airplane propeller looks like when shot with a Nokia N95. The rolling shutter makes the plane looks as if it’s dropping boomerang bombs that quickly disappear into thin air.
This topic also came up a couple weeks ago when a strange photograph of a boy caused debate regarding whether or not a rolling shutter was the culprit. In case your wondering, DSLRs have this issue as well.