Oh please, what was with that horrible edit. Won't vote down but if any video is deserving..

Calling fake. I think it’s a toy grenade and probably a coke/mentos or dry ice “bomb” underwater to make the relatively safe explosion that’s so poorly cut in at the end.

Notice he calmly holds onto the “grenade” for 3 full seconds before tossing it just feet away. No sane person would do that with a real live grenade that has a 4-5.5 second fuse and a fatality radius of 5 meters. Were it real, it easily could have exploded before hitting the water and he would be dead or severely injured. He didn’t even have a safety shield to hide behind.

A real golfball grenade sitting on the bottom like that would punch a hole in the best made pool, especially right next to the drain like it was, and the shockwave through the water would likely crack the walls.

Here’s what it really looks like (explosion at 1:14)

Moving this video to BSR's personal queue. It failed to receive enough votes to get sifted up to the front page within 2 days.