Back in college, I saw a couple of students holding hand next to a window, they said
"hey look at that, take his hand (last guy in the chain) and touch the side of the window"
I did it for fun, and was shocked as I touched the side of the window,
then someone else took my hand and he got shocked but I didnt, and so on,
the first guy had his hand out of the window and touching something like a cable or something
but only the last guy in line felt a big shock as he touched the metal frame the rest of the line felt almost nothing (or nothing I cant quite remember)
any idea as to why the last person touching the window was the one who felt the shock?