Haha, mine does the banging on the lid thing all the time to get my attention.
Yesterday I didn't turn his light on until late in the afternoon/early evening. I didn't feed him right away though. Instead I just kept 'working' at my computer. Until a few hours later...
All of a sudden I heard the hugest 'smack' on the top of the tank. Nearly fell out of my chair. At first I thought something was seriously broken.
Needless to say, he was fed shortly thereafter and didn't make a peep for the rest of the night, lol.