One does not realize an Explosions Moment is taking place while it is occuring. They will only come to see that it took place after it has finished happening.
Most explosions moments take place when one is high or intoxicated or about to become high or intoxicated. Explosions moments work best when one is high for it is most likely to occur at that time. This is because everyone is all riled up when they are high, and they will come to this moment where everything settles down, and if Explosions in the Sky happens to be playing then
You've got an Explosions Moment.
"You're a cool kid."
"Aww, dude, your the coolest. Like, seriously. You rock."
"Whoa. Was that an explosions moment?!"
"OH SHIT BITCH, IT WAS!"