Plenty of people have gone to their prom with a sibling - it's really no big deal... unless you make it one by posting pre-dance photos with a creepy caption.
That's exactly what one guy did, writing, "Refuse to let another man be my lil sister first prom date" alongside photos of them before the event.
Twitter reacted as you'd expect:
No word on how good of a time they had at the prom.
Photo: Getty Images