In a recent Kurzgesagt episode, they discuss the power of a black hole the size of a coin. They also explain two possible scenarios: 1) if the black hole had the same mass of a coin and, 2) if it had the same width as a coin.
What would happen to you if a black hole the size of a coin suddenly appeared in your pocket? Lets find out!
Source: Kurzgesagt – In a Nutshell