I've heard the story, however I don't know is it truthful.
Once Columbus came back from his first travel and was drinking beer in a bar hearing conversation about his travel from another table.
One of guys was young and very autraged, shouting that he could sail to the west too, and could open India too, and he must become admiral too.
Columbus got up, came toward the company and asked them to put boiled egg on the table upright.
Guys was trying to find a centr of heavy half an hour but nobody can.
Than Columbus biffed egg on table, bruised one side and put it on table upright.
- That is easy, - said youg guy.
I can like this too!
- Of course, - said Columbus.
But just after me!