When it's a buy one get one free promotion from Starbucks.
My local Starbucks offered a free "beverage" with every "beverage" of equal or greater value purchased by customers who completed an on-line survey. There were no qualifications on what was meant by "beverage". I duly completed the survey, went back to the shop and attempted to redeem my coupon for a free juice.
Sorry. No. Apparently juice is not a beverage. Only coffee and tea are beverages.
The Starbucks definition of beverage reminded me of Bill Clinton's definition of sex - something different from what most people, and the dictionary, would use.
Needless to say, the coupon has been passed to a colleague who drinks coffee.