I remember that when I was younger in s.m.w. I went down a pipe and... a crazy floating charging chuck head with hammer legs was waiting.It was possible to ride it like a regular yoshi. So,i'd like to know what caused the game to load such a weird looking yoshi...
EDIT: After looking for some infos I noticed that everybody saw that yoshi in a level with flying saws, but in my case I was in a forest level.