My mom recently taught me and my cousins a traditional game she used to make cranky babies laugh: you lay them on their back and tickle them all over and say "pluck the baby! pluck the baby!" and then you hold their feet and do bicycle motions with their legs and say "cook the baby! cook the baby!" and then you nuzzle their tum and say "eat the baby! eat the baby!"

Never fails to get a smile from babies and young toddlers, never fails to horrify anyone over the age of ten!