This is the Piss Christ:
This is probably the most infamous single photograph ever taken. It is a crucifix submerged in five gallons of urine. The thought of dunking Our Savior in urine is abhorrent, but the photo itself...well, if Serrano wouldn't have told anyone the liquid is what it is, this photo (it's huge--the original is 40x60, and I didn't even know they MADE Cibachrome that large!) would be hanging in the Vatican Museum. Note the ethereal glow around Jesus.
We all know the rest of the story...congressional hearings, threats to defund the National Endowment for the Arts and lots of righteous indignation from Jesse Helms.
So...why in heavens name didn't Serrano dunk a photo of Jesse Helms in his tank of piss and take a picture of that?