Burn them a copy of Thank You. If they dig it, then burn then a CD of 'deeper cuts,' such as Dead and Bloated, Lounge Fly, Peace of Pie, etc. Sprinke it with a few other deeper cuts like Seven Caged Tigers, Hollywood Bitch, etc. You always start with the more mainstream cuts before you hit them with the off the wall stuff. Don't do tracks like Art School Girl, Glide, or majority of SLDD at first. Ease them into that material.