Need more Pac-Man in your life? (Actually, everyone needs that.) Take a $14.99 IKEA Frosta stool, perform some simple handywork, and you're done.
The post by Michael Thuden describing this design calls it a "scrotum crusher", which rather ignores the possibility that you could rotate the seat to make the sitting position a tad more comfortable. That said, it's a design statement rather than a comfort one. Check the video for more details, and get sawing! (I'm contemplating doing this but painting the stool yellow for added authenticity.)