This might give you some anxiety.
This homeless mans head is caved in.
Does watching this video make you panic? Don't watch if you're claustrophobic.
You'll never believe what this couple comes across while spelunking deep in a cave.
Professional wingsuit pilot Alexander Polli attempts to fly through a narrow cave no wider than he is tall. He reaches speeds of 155 mph while following a precise trajectory leading to the cave opening. INSANE!