Noise-blocking headphones on the cheap

[mdlbear]

instructables : Jackhammer Headphones

These home-made hifi headphones work as well or better than Bose noise-cancelling headphones.
Cost: $20
Time to make: one minute.
Difficulty: none.
Unlike the Bose model, these block outside noise instead of cancelling it.

Basically you just buy good hearing protectors, and install the speakers from cheap phones in them. Not as good-sounding as my $99 pair of Sennheiser HD280Pro's, but 1/5 the price and probably better blocking.