Free Shake!

The other night I went to Mosburger. I like Mosburger because of their shakes.  Ususally, everytime I go to Mosburger, I get a strawberry shake.  So anyway, I was drinking my milkshake, and suddenly I noticed there was a crack in the glass!  I thought I should take it back to get another one, but I already drank half of it!  But since drinking from a cracked glass could be dangerous, I decided to take it back. The clerk apologized and I got another milkshake free!  So from now on, anytime I go to Mosburger I check to see if my glass is cracked - after I drink half of my milkshake!