Goku in “Unfinished Business”

I think I'm finally beginning to understand. The giant monster my grandpa warned me about...it was me. Yes, I get it now. I'm the one who destroyed the stadium at the world tournament and I'm the one who...who crushed my grandpa. Why didn't anyone tell me? All these years, Master Roshi and the others, they must have known the truth. Must have seen me transform into this...thing. I'm sorry grandpa, I don't know if there's any way I can make it up to you...I'm gonna try.