or we will both be sorry… There are a couple of riffs we could have picked from this classic, including that famously hypnotic, repeated F#-C#-E-F#-E-C#-B-E bass line, but on this occasion we ...

(Video embedded below the break.) A few simple parts later (Arduino, MP3 shield, magnetic door reed switch) and a tiny bit of code to randomize which bass riff plays, and it’s a done deal.