I never really throw them a great distance (usually just to clear rooms/buildings)
The story of the fire.
I was pinned down behind a fall tree and some shrubs, wriggling around until, eventually a bb broke through the cover and I got hit. Stood up army raised and bang, ouch and a burn sensation thought I had just taken a stinger to the side of the belly or caught the after shock of a flash bang.
I was wrong. Apparently the pin on my bfg had snagged in thrle shrubs and as I stood up it had been pulled just enough to release the spoon on the grenade without completely pulling clear. The bang was a nice 9mm round going off. The sting and burn was the flash of the round exiting the grenade, burning through my Leo kholer atacs ix ubacs which apparently isn't fire resistant, then setting about a 8 inch diameter section of my under armour base layer to thermo nuclear and melting it. The burn which on my side had various bits of said base layer in it and it took a good few weeks to heal up.
Ofcourse my mates were sympathetic and decided i had gone full suicide bomber on them.