Is anyone aware of a sort of poison that takes around ten minutes to work, has no(strong) signs of its effect before then, and causes the victim's body to spasm around a bit before he dies? Example: Victim takes poison. Ten minutes later, he falls down, unable to control his muscles properly, then finally dies from the poison. --- Thanks for the attention in advance. I've been researching poisons looking just for the one I need to achieve the effect I want but they usually fall just short of the timeframe I'm looking for.