On the special broadcast 'Exomentary Stage Main Cam', EXO's Chen revealed a behind story about Baekhyun, Lay, and underwear!

Chen said, "It was at our dormitory. Lay hyung took a shower, but he didn't have any underwear to change into. So Baekhyun gave him brand new ones that were unopened in its original pack." 

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Lay then added, "Baekhyun was originally trying to give me his underwear that he had worn before." To this statement Baekhyun strongly disagreed, and shouted, "How can I give someone the ones that I wore before?"