At a Wednesday night KISS show in Colorado, a fan captured a video of some sort of liquid pouring out from between the legs of Gene Simmons.
You can see the clip in the above video. The liquid in question flows around the 3:40 mark.
That has led many to believe that Simmons peed himself during the middle of a show. In fact, he's had to take to Twitter to defend himself.
Honestly kids, if I pee onstage, I would own it--I did not--However, if I crap in my drawers, I will make sure to stand proudly behind it.— Gene Simmons (@genesimmons) June 29, 2014