A Swansea man was torn from his bike after riding into a wire tied between two trees on a popular cycle path.
Jonathan Ace, from Bonymaen , was cycling along the city's promenade near St Helen's cricket ground on Monday morning when he fell to the floor after being struck in the chest.
The force of the fall caused his helmet to crack and left the 38-year-old with a massive headache.
Mr Ace said: "I was just out for a general bike ride but fortunately at the time I was having water so I wasn't going flat out.
"It [the fall] cracked my helmet and I was only going between 10 and 12mph. It's frightening if I had been going about 18 or 20mph it could have been a different story.
"The wire hit me on my chest and pushed me off the bike. There was fishing braid wrapped around my bike afterwards and it was all caught in the pedals and wheels.
"I've got scratch marks on the bike too. I had a banging headache after it and thought 'shall I just go home?' but I decided to just carry on."
With the wire striking Mr Ace across his chest, his main concern is that a child could have been cycling along the path at that time and been hit more seriously in the neck area instead.
He added: "The wire would have been neck height on a child.
"It's stupid. I don't understand what these people get out of it.
"I've fallen off to the side of the bike but if had been a child then they would have flipped over like a somersault.
"Where is the sense in these people doing it?"
Last year a cyclist suffered a concussion as well as head and back injuries after hitting a cord that had been tied across a cycle path between Gowerton and Killay.
David Stacey was taken to A&E and had to stay overnight in Morriston Hospital after the incident last summer.
South Wales Police is aware of the incident, which happened around 10.45am.
