From Dragon Ball Z, Goku's attack of gathering spiritual energy from the entire planet into a huge ball, and proceeding to throw it. Its strength is equal to how much energy it absorbs.
Goku fails to kill Frieza with it, and kills Kid Buu with it.
But most importantly of all, it takes over 9000 episodes to form.
SPIIIIIIIIIIIIIIIRRRRIIIIIIIII-*goes to pop popcorn*-IIIIIIIITTTTTTTTTTTT BOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO-*goes to the bathroom*- OOOOOOOOOOOOOOMMMMMMMMBBBBBBBBBBBBBBB
WOAH! Did you just see Goku "kill" Frieza with the Spirit Bomb?!