DOOJOON

He would get scared because he was talking to yoseob and when you pinched him he laugh and say

"So that's way yoseob had that Devilish look."

JUNHYUNG + HYUNSEUNG + KIKWANG

All three would most likely forget what day it was.

Junhyung would be writing a song when it happened so he would probably glare at you for pinching him.

Hyunseung would be getting something to eat and he would probably just look at you Confused before shrugging it off.

And kikwang would be watching TV and he would be like hyunseung

YOSEOB

I have a feeling yoseob would hide from you and when you weren't looking he would run into the bedroom and put something green on

DONGWOON

Would probably laugh like doojoon when it happened and say he wished he had a memory like yours because he forgot the day