Menacing Spike wrote: "cuz you need one" or "cuz you need to run"
"'Cuz you need one" seems to be missing a syllable... "'Cuz you need to run" kinda fits (it's a stretch, but no more than "Ash'd" => "asked"), but unless I'm missing a reference, isn't much of a joke...
Oh wait, the whole thing is one joke... Google tells me the lyrics to the song go:
I'm not gonna write you a love song
'Cause you asked for it
'Cause you need one
So... yeah. "Nidoran" and "Need one" seem to have a fundamentally different syllable count that makes the pun an extreme stretch.