A Texas man spent five days sipping at the largest coffee ever ordered at a Starbucks, and he didn't even have to pay a penny.

Andrew Chifari, 27, entered the Dallas coffee shop and asked baristas to fill his 3.8 litre glass with a mammoth frappuccino. They obliged, pouring in 60 espresso shots and loading it with whipped cream. 

According to Dailyzone.com, he escaped the hefty bill by providing a coupon for one free drink which he had earned through a customer loyalty scheme.

Starbucks spokesperson Maggie Jantzen did not encourage such behaviour, saying "This particular customization was certainly excessive. It's something that we don't encourage."

Chiafri had no such regrets, saying "It was worth it. Overall, considering how much caffeine I consumed, I would have expected the sleep issue to be a lot worse than it was."