My parents cat has been staying with us, and recently turned into a cat burglar and stole a brand new catnip bag from inside the neighbours home. He has now brought home a second one from somewhere else as well - we're not quite sure where, but the neighbours only claimed one. Anyway - our cat Eden has decided she quite likes these bags too (although I don't think she likes them enough to steal them from someone else) and I caught her napping on one the other day - she lifted her head as I came up to take the shot, but she had had her head on the bag and her eyes closed.
Then she started getting a bit more frisky. I think it must be a special type of catnip as she's never bothered with catnip toys before.