Shy Guy is the little masked mischief-maker of Nintendo's Mario universe, first showing up in 1987's Yume Kōjō: Doki Doki Panic, which reached the rest of the world as Super Mario Bros. 2 in 1988. The toing itself is a classic cartoon spring effect, the same rubbery family as the boing, and meme editors love pairing that quick twang with the shy little enemy. It pops up in bouncy Mario edits, springy jump compilations and cutesy reaction clips, staying popular because the character is so recognisable and the sound is instantly funny at any length.