Last nights replay of Mr. Garrison's sex change has got to be one of my favs. Not the grossest, that'd be hard to pin down.
Please, it's not Mr Garrison gets a sex change, it's "Mr. Garrison's Fancy New Vagina." Call it what it is.
There can be only one grossest* South Park episode.
And that episode is "Scott Tenorman Must Die".
*Grossest, in no way, implies "bad".