Helicopters can feel dangerous enough when they're flying normally. But when they start doing flips, spins and nose dives, you get nervous just watching.
This week, Red Bull posted a YouTube video of daredevil Chuck Aaron -- the first and only civilian pilot ever to be licensed to perform helicopter aerobatics -- doing just that.
The 54-year-old pilot has spent more than 20,000 hours -- or 833 days -- in the air, so you can assume he knows what he's doing with these stunts. Without that experience, it's safe to say videos like the one above wouldn't be possible.