What is the craziest and most impressive thing you have seen in relation to magic?

I mean things you've done or seen that made you think something like "this looks like something out of a movie". Something that made you realize that magic can be very powerful. I know that magic can be used for small things or big but progressive changes in life, now I want to know what is the most impressive, showy, fast or effective thing you have seen or done with the use of magic.