Do you guys remember how Suho accidentally stepped on Sehun's foot in their EXO M's Growl Music Video? 

Well, I've forgotten about it after a while, but then I watched EXO K's Overdose Music Video....

Hahaha, poor Sehunnie~ 
He was smiling widely right after the 'drum-dance' part near the end, where assumingly, Baekhyunnie accidentally hit his head xD