Why? Well...
I really need to practice any musical instrument right now.
Yesterday I went to the local Guitarget to see what kind of used gear might be there, and there was a kid trying out a Les Paul with his family watching him. You know how you can tell when someone has learned only from tablature? Everything is played as notes in order, but there is no spacing between notes nor is there any emphasis on notes. The kid was trying to play Purple Haze, but if not for certain passages no one would have known it. One could have run a thumbnail slowly across a comb and gotten the same result. Dah dah dah dah dah dah... It was horrible. The kid was likely hitting all the correct notes, but had no clue why he was playing them. He surely never tried playing along with the CD or video. The kid may be a nice kid with a nice family, but someone with some patience and the ability to teach needs to let the kid know that he has failed at playing Purple Haze.
However...
if he were to be one of those kids with an attitude then it would be fun to out-Hendrix everyone in the store with a banjo. Banjos can be LOUD. Some people cringe when they hear banjos. Hendrix. On a banjo. In. Your. Face.