A few years back I decided to make an evil sim, so I downloaded a creepy house and basically kidnapped a sim. I trapped the sim in a room, waiting for them to die of hunger or something, but extremely underestimated how long it takes a sim to die of starvation. After multiple sim days, I was probably getting close to the sim dying, but I suddenly felt really bad for this sim for some reason...
So after waiting all this time, I end up letting the sim go... so I basically wasted about an hour of my life because of guilt.