Recommended
High Voltage AC/DC Effect on Human Body
Why people recommend it
Mehdi Sadaghdar tests how AC and DC at rising voltages feel on the body; cited in shock-safety questions, though viewers dispute what it shows about DC.
Watch for: the 334 V DC touch at 3:23
In their words
I was watching this YouTube video. The content maker simply declared that 200/300 volts DC is safe to touch.
Sadat Rafi on electronics.stackexchange.com, May 2020. CC BY-SA.
At 3:23, when he touched the 334V DC, it still hurt him to the point that he couldn't hold his fingers on it.
Gabriel Luci on electronics.stackexchange.com, May 2020. CC BY-SA.
Another useful demonstration he provides is here.
WhatRoughBeast on electronics.stackexchange.com, Sept 2018. CC BY-SA.