PRAGUE: Some say the pen is mightier than the sword. If true, Czech President Vaclav Klaus will soon be a very mighty man. More than 5,000 Czechs have signed up to a Facebook campaign to mail pens to the president after a video of him sheepishly pocketing a pen he took an obvious liking to during an official signing ceremony last week in Chile became widely popular on the Internet. Klaus says it's customary for leaders to keep pens after signing accords. But the manner in which he sized up the pen – encrusted with semiprecious Chilean stones – and then sneakily slipped it into his pocket while he sat at a desk alongside Chilean President Sebastian Pinera has earned him the ridicule of some of his countrymen.