In 1974 the band I roadied for, The Sons of Champlin, toured with Three Dog Night. We opened the show, they closed it. Most of the time we could get our gear off the stage and into our truck before Three Dog Night played, and then we could get back to the hotel early.
We did a show in an indoor football stadium in Pocatello, Idaho, and the management wouldn't let us start up our truck inside the building until after the show, so we were stuck there even though the truck had been loaded and we were done for the night.
Hanging around the dressing room, one of the guys in the band said that for a hundred dollars, he would "streak" the stage. He didn't have to say it twice; in seconds there was several times that amount on a table. That was something we would pay to see. So we made a plan.
The singers in Three Dog Night went offstage during their performance for a costume change, and the keyboad player took an extended solo before they came back on. On this evening the keyboard player finished, the freshly costumed singers stepped out onto the stage...
And a man wearing nothing but a smile strolled across the stage six feet behind them, flashing the peace sign to the crowd. Which erupted, something the singers didn't understand, because they hadn't done anything yet.
No one stopped the streaker. He ducked into our truck parked behind the stage and dressed quickly, then joined the crowd of security people looking for that guy, who seems to have vanished.
Three Dog Night were not really happy when they got the details.