Maybe not cool, but definitely amusing ...
So, the food dish contains worm pieces and an axolotl is standing at the food disk looking down at the worms. 15 minutes later, the axolotl is still there, worms uneaten. I pick up a piece of worm with the tongs and raise it 1/2 inch to his mouth. SNAP! and a look that says, "It is about time you fed me!"