If a stealth bomber crashes in the middle of a forest, and no one is around to hear,

[The Nuclear Fish]

it does it make a sound? Yes, one more of these...

[joefer]

What stealth bomber? I didn't see any stealth bomber.

[Heat_X]

hehe a stealth bomber XD well yes...
stealth bombers are stealthy because when sound bounces on them, the sound doesn't go back to the radar. so yes.

[lost.]

yes because all the woodland creatures heard it

[ProfIgor]

Like the Big Bang it is likely a Big Hush.

[Addy]

Sound is categorized as how you interepret waves of noise. If absolutely NOTHING is around to hear it, technically...it isn't sound.