First you have to buy the INCUBATER and you have to make mutant plants, at least 4 plants. After you make the plants, feed and water them until they become big plants. Then invite the sim you want to "torture" over the phone. When the sim comes wait until the sim ring the doorbell. after it rings go into buy\build mode and put the 4 plants at each side of the sim.(make sure you don't feed the plant or water it in order for this to work). Put the plants in the pattern of a cross. After this watch the sim get "tortured".