Tim Hortons coffee chain brought back their famous ‘Roll Up the Rim to Win’ contest on Monday, offering 40 Toyota RAV4s and 100 prepaid MasterCards worth $5,000 each.

“Roll Up the Rim to Win is our way of thanking our loyal guests each year for making us Canada’s favourite coffee,” Dana Brochu, category brand director of coffee and tea, said in a statement.

“Nearly eight of every 10 cups of brewed coffee poured in Canada are purchased at Tim Hortons, and that’s something worth celebrating with our guests.”

Click here for full contest rules.

Other prizes on offer this year include 1,000 Napoleon gourmet grills, 25,000 Tim Cards woth $100 Tim Cards each, and millions of coffee and food prizes.

But what happens if the winning cup was purchased as a gift?

“It’s a Canadian tradition to treat friends to Tim Hortons coffee and with millions of prizes available; there is a chance that coffee rolls up to something more,” Brochu said.

“Our survey showed that etiquette varies depending on the nature of the prize, but the vast majority of Canadians indicated some reciprocation is in order.”

While not everyone would give back the car – 65 per cent of Canadians surveyed said they would keep the car if treated to the winning coffee by a friend – 73 per cent would treat their friend to a special gift in return for the car.

The contest began Feb. 18 and will run until the supplies run out. Prizes may be claimed until May 19, 2013.

What would you do if your friend bought you a winning cup? Let us know in the comments.