I was reading this question: How much voltage is "dangerous"? and it seems to me that in the right conditions, connecting yourself to a live outlet is perfectly okay.
I am in the United States, 120v hot lines @ 60Hz. Let's say the following are using your right hand/arm. So no circuit completed through the heart.
If I stuck a fork in the "hot" line an outlet, and touched it with a finger, R of body is about 40k ohms, so 120/40000=3mA. I would barely feel this.
Even if I grabbed the fork, R of body is about 15k ohms, so 120/15000=8mA. This would hurt just a bit!
Is my math here correct? Is this activity actually safe? The linked question says the induced currents would be fine.
I know there are other circumstances that change the body's resistance, but I am just considering the circumstances mentioned above.