21 Pilots opening for Panic at the Disco and Fall Out Boy in San Francisco. It was AMAZING. 21 were flawless, and really deserving of opening. Panic was a little disappointing because it was when Spencer had to take a step back for rehab. And of course FOB KILLLLLLED it. Then Brendon came out to do a cameo in one of their songs which was amazing. But there was a lot of moshing and actually a few bad injuries, which was a little scary to say the least.