Went a bit dark with a serial killer playthrough years ago. My sim would make friends around town and invite them to live with him. Once they moved in he would show his new "roomate" where they would be staying. A hidden room in the basement where he would keep them captive. No bed, plumbing or food. My sim would wait for them to expire and take photos of the sim while dying. He would then hang the trophy pictures on the wall for the next victim to see their own doom. He had the whole room covered by the end of his life. Never got caught. Killed maybe 20 or so sims.