Cathal Devlin posted video to Facebook showing two of the three teens jumping into the sea as waves whip across the pier.

Devlin, who lives in Galway, posted the video "to highlight the absolute madness and stupidity of what these youngsters are doing."

"I would like to make it very clear that I or anyone else do not condone or see any 'macho' side to this incident," Devlin wrote in the post. "In a couple of hours this video clip has received 168,000 views across the globe and everyone is of the same opinion 'fools', 'eejits', 'morons' and worse. Count your blessings and do not, ever, repeat this type of 'stunt'."

In the video, two boys jump around at the top of the pier in swimsuits as another in a raincoat hesitates on the dock.