my cherry barbs like to grab the big flakes and run away, the others usually chase and it looks like they are having fun... there is other food, it's more about forced sharing.
lately, in terms of playing at meal time, I've been taking a pinch of frozen blood worms in my tweezers and holding it above the surface, starting at the surface and lifting it until it's about a quarter inch above, trying to train them to jump for it. it seems to confuse them, but they are starting to try. they certainly splash a lot of water around. it's fun to see their fins emerge.