1. Fan creates custom t-shirt at DIYshirts.com

2. Fan goes to Denver Jane's/Nine Inch Nails show

3. Fan gets angry with setlist and throws the shirt off his back, at Perry

4. Perry takes shirt and struts it around stage, and uses as a discussion prop for intro to "Been Caught Stealing"

5. Fan gets a standing ovation, but doesn't get his shirt back.

We're still waiting for video of the event to surface.