I thought I saw, years ago, part of PCE Maniax where they stacked a Mega Drive with every peripheral they could find to see if they all worked together. A PAR, an Xband, a Game Genie, Mega CD, a 32X, Sega Channel, Sonic and Knuckes with Sonic 3, etc until it was 2 feet high. It did work in fact, and I'm amazed the power cables didn't melt from all the current.
Maybe this was someone elses site.