Battletoads for the NES is said to be the hardest game, period, of the NES Library. (Not counting games that are basically "unplayable".) Just announcing that you're doing a Let's Play of it guarantee's an enjoyable video due to how upset you'll get dying to it so much.
But, how enjoyable is 4 people doing an LP of it at once?
Let's find out in this over 3-hour long Let's Play.
http://www.youtube.com/playlist?list=PL201F1C36731623D0I'm sure you'll love it.