A dispute is brewing in Quebec over a sport utility vehicle after a winning "Roll Up the Rim" coffee cup was found in a garbage can.

It all started Tuesday in Montreal when a 10-year-old girl found a Tim Hortons cup in a trash bin, according to a report in the Montreal Gazette.

Remembering the coffee chain's promotional contest, she plucked it out of the garbage. The girl couldn't roll up the rim by herself, so she asked for help from a 12-year-old friend.

When the two girls discovered the cup was the winner of a $28,700 Toyota RAV4, they took it to a teacher at the school, who called the girls' parents.

The 10-year-old's father, who wasn't identified, arrived first and took the cup, saying he planned to sell the vehicle and would offer some of the money to the second child's family.

But when the 12-year-old's mother, Nathalie Prevost, showed up, she said her family deserved to take the prize.

Prevost then called a local radio station to ask for legal advice, propelling the story into the media spotlight, said the Gazette.

The father of the 10-year-old said Prevost's radio appeal went too far and that he has changed his mind about offering that family any money.

A spokesperson for Tim Hortons told the newspaper that whoever submits a winning tab to the company is considered the official prizewinner.

Under the contest rules, the girls can't claim the prize directly because they are minors.