웃지마! - 정준하

Don't Laugh! - Jung Jun-ha

Oot-jee-mah! - Juhng Joon-hah

This meme primarily gained popularity in the mid-2010s, especially when the MBC variety show 'Infinite Challenge' was at its peak. The distinctive "bursting out" or "getting angry" demeanor shown by Jung Jun-ha within the program, coupled with this particular line, left a strong impression on viewers and spread as an internet meme.

The "Don't Laugh!" meme originated from scenes in 'Infinite Challenge' where Jung Jun-ha, finding himself in a particular situation, would tell those around him who seemed to be mocking him or taking the situation lightly, "Don't laugh!" with a serious or somewhat agitated expression. This meme is primarily used to convey a warning message to others not to laugh when a situation is serious or grave, but people can't help but laugh, or when laughter erupts. It is sometimes used self-deprecatingly when one is in an awkward predicament, and also for comedic purposes, mimicking Jung Jun-ha's character.

It is widely used across all age groups, primarily from late teens to those over 40, who watched 'Infinite Challenge'. It is particularly familiar to younger generations active in internet communities and social media, and enjoys high recognition among both men and women, based on the program's fandom.