So I was screwing around with VY Canis Majoris and accidentally made it 100000 AU in diameter. This turned it into a super-ultra-mega-ridiculous black hole and got me started on a path to universal annihilation.
Before long I had a black hole that was something like 8,000,000,000 million light years wide. Galaxies would orbit it at several times the speed of light and at max zoom it practically filled the screen. This monstrosity existed for about 3 minutes before the game detected a critical error and then crashed.