40. 97 Ways to Make a Baby Laugh by Jack Moore
I happened across this in the BookMooch inventory of someone I was getting another book from, and was intrigued. Some of the tips really will work (which ones rather depends on your baby and just how you put them into practice, of course), but largely this is worth a bit of amusement to the adult reader in imagining how the rest would go across.
Not a ‘must have’ or even ‘must keep’ in my opinion, but a bit of fun to read through.