When something so hilarious, gross, sexual, or just plain weird happens that you need somebody to put it into a manga.
Jessie: Hey Samantha, can you look at the charactor I drew?
Samantha: Yeah. Hey, wait, did you just draw Garret?
Jessie: It's a girl! See the boobs?
Samantha: No, I wasn't looking. I'm not a perv.
Jessie: If you were a perv, you would be a hot guy.
Samantha: Gyaaaaaa! This is so a Manga Moment!