My buddy just sent me this pic in an email. Yup... it is what you think it is. A sticker inside the bowl of your toilet, to measure your turds! I ain't shittin' ya.
Here's the product description from turdtape.com.
"The is a 3x12 water resistant sticker that can go onto or into your toilet. Order one today so you can start measuring those monsters and we will ship it straight to your ass!! Who knows, you might be the next champion."
The cost $3.00 US. I just wouldn't want to be the guy who has to install it.