Poison Dart Frogs. This little guy has a toxin called pumiliotoxin. Other frogs may have batrachotoxin or histrionicotoxin. These aren't the type of frogs that you want to lick just for a good time.
Being a neuroscientist, my favorite frog-derived compound is epibatidine for its pain killing properties. It activates the cholinergic system via nicotinic receptors, and it is very expensive so you shoudn't ever knock over the vial or accidently place the plastic container on a hot hot-plate.
I just wanted to give you some science--you never know when you will need the power of the frog. I also wanted to continue the frog theme from yesterday, bringing it into a more positive light than the whole frog murder thing.