“The question was floated at a comic jam not long ago by a cartoonist who’d been slipped a panel to complete. It showed an artist rubbing himself out. Sidestepping the picture’s metaphor, the cartoonist instead was racking himself for a sound effect to amplify the action. The other cartoonists sat at tables throughout the room, their noses burrowed in unfinished pages. ‘I know!’ someone at the back shouted…”
This article on conveying sounds in cartoons is a really interesting read. Check it out…