I don't sing, but I def. do the crazy accent/voice thing... pisses my wife & kid off. I also have the problem of forgetting how I do voices. I used to be able to do a spot on Don Knotts.... But for the life of me I cannot do it anymore.
Also, do you ever have days where whenever you try to do accents... they can only come out sounding scottish; Kind of like on the office?