It's impossible to whistle on the moon

No matter how hard they try, astronauts can't whistle while they work. Why? It has to do with the air pressure in their spacesuits.

From ABC News:

So why can't people whistle while spacewalking? [Former astronaut Dan] Barry said there is a simple explanation.

"You can't whistle because the air pressure in the suit is only 4.3 [pounds per square inch], and normal atmospheric pressure is 14.7 psi, so there are not enough air molecules blowing by your lips to make a sound," he said.

What would Barry have whistled if he could have? "'Whistle While You Work,'" he said.

As io9 points out, astronauts will have to stick to humming.

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Image: Buzz Aldrin on the surface of the moon on July 20, 1969 via NASA