I've got "what shall I do with the rest of this rhubarb" running round my head to the tune of "what shall we do with the drunken sailor"
@fkamiah17@syzito.xyz
One Song To The Tune Of Another - so traditional it got immortalised on ISIHAC unlike Sound Charades for example.
I rearrange music in my head all the time.
Plus I doubt I know the original lyrics to most songs TBH.