A real shocker!!
Just like it looks in the video demo! One second your thumb is normal, and the next- you've poked a nail right through it! No blood, no pain- but wow, what an illusion!
This one is very easy. And you can play it a number of ways. Do it as a comedy effect, with lots of noise and fake wailing and carrying on. Or do it as a more serious, gory street magic effect. Either way, it's something your audience won't forget!