See that up there? That's an Otamatone. They're basically little fretless musical-note-shaped instruments that you squeeze to produce a sound whose note is wherever your finger is on the "fretboard." YouTuber otamatoneraptor took his love of metal and love of Otamatone and combined them into cover songs that are nothing less than funny as hell.
Go ahead and ruin such songs as System Of A Down's "B.Y.O.B," Judas Priest's "Painkiller," Iron Maiden's "Number Of The Beast" and a few more below.
[via The PRP]