That's what an Australian man experienced yesterday.
An Australian surfer had a close encounter with a shark off Sydney's Bondi Beach on Tuesday when it jumped onto his board, giving him a huge fright in a near-miss witnessed by lifeguards.
Dean Norburn said he was surfing with two friends early in the morning when the shark launched itself out of the water onto his board.
"We were just past the break and as I was paddling in a little bit, I slowed down and went to sit up on my board and... as I did that, the shark brushed by me and landed on my board," Norburn told AFP.
"It gave me a bit of a shock as you can understand. And as quick as it came up it jumped off my board... swam towards one of my friends, swam under his board and then swam off.
"It's really quite freaky... it was my first (shark encounter) and hopefully it's going to be the last," he added.
Bondi Rescue Lifeguards confirmed the incident, adding that Norburn was not hurt and the shark - which the surfer's friend said looked like a bronze whaler - was about six feet (1.8 metres) long.
"Lifeguards spoke to both men and cleared the water afterwards. Will be a very memorable surf for both guys," the lifeguards said in a Facebook post.
There's more at the link.
That'd sure unclog any blockages I might have!