The magic of the placebo

I was doing my research, then I found this video.
The guy in this video played magic stuff, the first one was not very amazing, but the second one shocked me at the beginning.
It reminds me when I was little, my dad was busy traveling between cities for his work, sometimes he took me with him. Once we went to a place, I was too young to remember which city it is. After we got off the train, we saw a big crowd of people. When we walked close, we found somebody was standing inside the crowd and cuting his wrist. I was shocked, I couldn't believe what he was doing, then my dad quickly took me away. Even now I can still remember the bleeding and his fellow was begging for a little money.
Yeah, I hope it was a trick.
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