How can children easily incorporate fun sound effects (onomatopoeia) into their comic strips?

Kids can add sound effects by writing words that imitate sounds (like 'BOOM!', 'ZAP!', 'CRASH!', 'WOOF!') directly into the panel where the sound occurs. Encourage them to draw these words in big, exciting letters, maybe even giving them jagged or wavy outlines to make them look more dynamic. This adds energy and helps tell the story without needing extra pictures.