The effort that goes into breaking some world records is enough to bring tears to your eyes.
Mehmet Yilmaz squirts milk in a record breaking attempt
But record hopeful Turkish Mehmet Yilmaz's eyes don't water, they milk.
Mr Yilmaz, 28, has mastered the discipline of eye-squirting - sucking milk through the nose into the eye before squirting it out across a table.
He hopes his latest distance of 2.795m (9.2ft) is confirmed as breaking the former record of 2.615m (8.6 ft) held by a competitor from British Columbia.
"I have been working for almost three years, I practised with more than 100 litres of milk," Mr Yilmaz told Reuters television.
"Now I can say that I don't like milk a lot, I cannot look at milk and milk products as food."
How do you get into such a sport, or discover such talent? Watch for bubbles in the bath.
Four years ago, Mr Yilmaz found bubbles were coming out of his left eye while swimming in a pool.
He later found out that the bubbles came from a pressure leak inside his eyelids.
When he saw a previous Guinness attempt on television, he thought he would give it a go.
But the feat carries a "don't try this at home" warning, as only a few people around the world have the necessary physical anomaly.
The Guinness World Records must confirm the attempt before Mr Yilmaz can call himself a record holder.