Minecraft, I tried summoning and defeating the Wither and was woefully unprepared. The entire world near the fight was filled with craters from the explosions. I was getting ready to throw the entire world away. Then I decided to just cheat and turn Creative Mode on for 1 second, the Wither disappeared and I was able to continue playing, now with PTSD.
It didn't help that I was playing on Bedrock (switch), which apparently has a much more difficult fight than in the Java edition.