It is impossible to hum if your nose is plugged.
When withdrawing money from an ATM, the 'whirring' sound before your money pops out is actually a recording. The actual mechanism is so far back that you can't hear it.
More Miscellaneous Facts
Donkeys kill more people annually than plane crashes.
In 1982, a high school student from Los Angeles, California unscrambled the Rubik's Cube in 22.95 seconds.