Comet.. it makes your teeth turn green.
Comet.. it makes your whole house clean.
Comet - it makes you vomit.
So drink Comet and vomit today.

Variation:

Comet - It makes your mouth turn green!
Comet - It tastes like Listerine!
Comet - It makes you vomit!
So try some Comet and vomit todaaaay!

(ed: Sue tells me Comet is an green coloured, American gritty cleanser, often used to scrub sinks. I've not heard of it before and still don't understand *why* you'd drink it?)