Being on stage isn't easy. There are a million ways a performance can go wrong, both internally and externally. Generally that list doesn't include weeping because you've just eaten a ghost pepper, but this is the internet, and here there's a time and place for everything.
As you can see in the video of Denmark's Herning Boys Choir above, eating one of the hottest peppers in existence makes performing significantly more challenging. The choir runs through "O Come, All Ye Faithful," half without the pepper, for a very nice performance, and then half after over 1 million Scoville units of heat have taken up residence on their tongues. There's coughing, tears, and general despair, but somehow they make it through the whole song.