It's been a while since we saw some good base jumping and wingsuit flying - not to mention proximity flying, where participants try to fly as close as possible to the terrain without actually hitting it. Here's a video with all three elements at once. For once, the music's not bad, either. Watch it in full-screen mode for the best perspective.
The only time I've seen trees go past above my head like that was aboard South African Air Force helicopters in a combat zone. It was pretty sphincter-tightening then, and I daresay it had the same effect on the jumper in this video too . . .