We all hate them, but sometimes it can be funny.
Recently in a private server with about 4 people in it, in voland, I was on bravo and a alpha guy, came up to me with 3 nades. I was reloading, and he threw one. I bounce up to the roof, unharmed. He jets up to me and nades me again, I bounce to the floor, and this time, i lose maybe 1/4 of my health. Then he comes up behind me, and nades me once more, and I bounce towards the bridge, now with maybe 1/2 of my health left.
By then I'm laughing so hard that he procedes to just blast me with his gun.