Saw something hilarious at auto zone yesterday... an obviously non-car-guy was trying to recharge his A/C on his own, and bought the little pigtail and a can of refrig.
Went to screw the pigtail on the can without reading the destructions and had the punch valve screwed in all the way... punched the can before it got threaded and sent the freon can launching like a missile right at me sitting in my jeep! I'm trying to duck and thankfully it took a left turn and went launching across the parking lot. wound up going a good 100 yars or so and luckily didn't hit anything or anyone, so I got a good laugh out of the deal
One of those things you wish you could have caught on video