If you have no idea what a Tesla Coil is, don't feel bad. I didn't either. But I looked it up for you. They're electrical devices that create high voltage low current, high frequency alternating current electricity. The cool thing is that you don't need to know what they are to know they rock.
Growing up in the 70's, one of my favorite hobbies was going to rock concerts. Once I got into my mid to late teens, I was working and always had money to buy concert tickets. I used to live for going to shows. Recently, I found some concert ticket stubs from some of my favorite concerts.