tony sayer wrote:

Don't you believe it!. Well if you do, then grab the mains in one hand
and note the results.

In typical dry indoor conditions you will feel nothing, as Chris rightly
says. I've often demonstrated this to people, sometimes to their great
surprise. It provokes thought.

Don't try it outdoors though while standing on an aluminium ladder with
its feet in damp soil...

And don't try it if the frequency of the supply is a few orders of
magnitude higher than 50 Hz or you'll discover the meanings of "earthed
via a reactance" and "skin effect" at the same time.

--
Andy