Old MacDonald - ever been more fun?

A crowd pleasing app can give a teacher 'thinking time' to get the next activity cued up, or help you manage to stretch out a topic and refresh batteries. We were reviewing animals and there was a request for Old MacDonald (and I love the app developed by LoeschWare)...aim of the game is to choose farm animals and not wild ones - like tigers, sharks & camels, which if chosen are variously dispatched to many giggles.