Between a chunk of kryptonite and a hard place

Best.Pun.Ever.

Amazing Technicolor Kryptonite: Makes Superman start singing show tunes a la Donny Osmond.

The reference to “pink kryptonite” sounds like something from a bad fanfic (or somebody having fun at wiki’s expense):

If I recall correctly, it was mentioned in a very throwaway fashion during Peter David’s run on Supergirl.