I've seen a few incidents, but this one sticks out.
1. LHR T4 Delta Airlines. 767-400ER taxis onto gate.
The Security Guard for the aircraft (every American carrier requires them to 'guard' the aircraft and search everyone who goes near the plane) walks behind engine 2 whilst the captain nudges the aircraft forward a bit more.
This guy gets blown 25 feet onto the taxi way, gets up and gets blown another 10 feet again. I couldn't believe my eyes. Only minor cuts and bruises, but he was so lucky he walked behind the engine instead of in front.