What Do You Call a Portable Toilet Used for Parking 'Dibs'?

When Patch asked what the weirdest object is that readers have seen holding "dibs" on a parking space, reader Wendy Hey sent in this great photo of a portable toilet that she snapped in North Center.

It's just dying for a clever caption, but I was drawing a blank. So I queried my co-workers. Many of them wrote back with, well, potty humor that I can't print here. Among the more PG-13 entries: "BYOTP" and "Potty Wins At Dibs; No One Will Touch It"

So, dear reader, I turn to you. What's the best way to caption this photo? And please keep it, you know, clean.