I used to throw helmets, but that got expensive. Now I throw hammers, they tend to survive the impact. :)
Back in the day, I got pissed off at a welding machine I was using and kicked it...a tad to hard, I suppose... "eeeee.....WHUMP!" it wasn't damaged, but I'm sure that I scarred it emotionally.
And grinders, man...My first welding job I lost it and threw one through a part rack. In one side and out the other "FOOMP, KABASH!" At the same job, a spiked a 7" off the ground, man, Makita's can take a beating.
Ahh, memories...