At the risk of further perpetuating the evil known as Rebecca Black's "Friday," here's a pretty amusing cover by SongstaForLife, a man of many t-shirts and many facial expressions.
Seriously, terrible song, but something about this guy and his multi-part harmony is strangely mesmerizing. SongstaForLive, aka Brandon Toy, is a self-professed "singing nerd" who makes videos. For more from this guy, check out his YouTube channel here.