Gallium.
https://chemistrytalk.org/gallium-element/
Gallium is well known as a metal that has a melting point just above room temperature, which means it can literally melt in your hand.
Ten surprising facts about gallium
Gallium expands when it freezes, one of the few substances to do so.
A small amount of gallium will destroy anything made out of aluminum, including aluminum cans. It also attacks steel, making it very brittle.
Although it can melt in your hand, it won’t boil unless you heat it to 4,000F – the largest range of any element.
It forms an alloy with Indium and Tin that is a liquid well below room temperature.
There is a book based on gallium, called The Disappearing Spoon. You can watch how to make a disappearing spoon here.
Dmitri Mendeleev, the creator of the periodic table, is well-known for predicting the existence and the properties of the element gallium, a few years before it was discovered.
People sometimes wear gloves when handling gallium metal – not because it is toxic, but to avoid having to wash off the “gallium stains”. It also stains glass.
Like aluminum, most gallium compounds are fairly colorless.
Like mercury, a blob of liquid gallium in water can simulate a “beating heart” when oscillating between oxidation and reduction in the presence of both an oxidizing and reducing agent.
Gallium is used in special high-temperature thermometers because of its high boiling point and low melting point.
F&G
Notice they don't touch the nail. Don't want it to deform from their body heat.
Can (You) say Uri Geller.