Yoshis Final Smash in Super Smash Bros. Brawl is to get wings and start to breathe fire. This was inspired by Super Mario World in which eating a blue shell and a red shell gives Yoshi the ability to fly and breathe fire.
I imagine Yoshi thinking, "Mario, why hast thou forsaken me!?" before plunging to the bottomless chasm. Certainly the series condones too much violence against reptiles in general... a nightmare for Spike, in this case. XD