Coastguards have issued a stern health warning about the craze of jumping into open water from great heights.
It follows footage of so-called "tombstoning" in Aberdeenshire being posted on the video-sharing internet site YouTube.
Jumping into the water from cliffs and bridges is believed to have killed five people in the UK last year.
Aberdeen Coastguard watch manager Bob Forbes said people did not realise the risks of the "stupid" stunts.
Mr Forbes told BBC Scotland: "Tombstoning is incredibly stupid and dangerous. And posting it on the internet is also incredibly stupid.
"Jumping from a height, you do not know if you are going to hit rocks."
He warned: "You do not see the lifeboats picking bodies out of the water."
Mr Forbes said people also took the risk of spending their lives in a wheelchair through injury.