Long-Haired Hare

Bugs pretends to be a conductor in order to torment opera singer Giovanni Jones. Near the end of the cartoon, he hold Jones a note for 45 seconds, until it causes the collapse of the orchestra shell above the singer's head, and then for a few more seconds when he causes a rock teetering on the collapsed frame to fall onto Jones, presumably crushing his skull. (In other words, Bugs literally "brought down the house".)

Example of:
Incredibly Long Note