Looking for plays like pillowman...

On Friday I saw The Pillowman and was blown away. By chance does anyone know of any other plays with such suspense and dark humor (with a disturbing edge)? I have had a few plays recommended to me, but they all seem to stick to one thing or the other. If they are disturbing and suspenseful they lack any comedy. If they are suspenseful and comedic they are not all that disturbing (Deathtrap for example)... If anyone knows of anything please either reply or PM me...