When stomped on by Mom, it will paralyze the leg and prevent any damage from the attack (as of 11/6/14). Presumably a bug. NOTE: when fighting red Mom, will only work on every other stomp.
Had a run with Midas Touch and got a "Relax"-pill. 3 out of 4 poops were golden ones. I am not sure if this was caused by Midas Touch
5 Luck does NOT cause 100% golden poop rate, unsure what it is.