A kid walks in late to class, the teacher asks him "why are you late?" and he replies "I was busy throwing pebbles in the lake" Another kid walks in late to class and the teacher asks him "why are you late" and he replies "I was busy throwing pebbles in the lake", The last kid walks in and the teacher says "why are you late?...and why are you wet?" and the kid says back REMEBER MY NAME IS PEBBLES!!
Person
I've heard it the same way up until the end. After the second kid sits down, a boy dripping wet walks into class. The teacher looks up and says, "Thank you for joining us Pebbles." It's just as good as your ending but I just wanted to give another suggestion.