Put a condom over it -- gets rid of the shock and antifreeze(*) hazards. Or just stick it under an armpit.

(*)- Antifreeze is toxic, but not THAT toxic. As in a drop won't actually harm you. If it were that toxic, a lot of mechanics would be dead or have kidney ailments from the fumes or absorption through skin.

Another interesting fact is that ethylene glycol isn't terribly toxic in and of itself. It's metabolized by the liver into toxic oxalic acid, but ethanol is a competitive inhibitor of that metabolic pathway. One treatment for antifreeze poisoning is to essentially keep the victim drunk until the antifreeze is excreted. So before the OP tries this test, he should get roaring drunk. For his own safety.