1. Go here:
here
2. Select "Problem with a Product"
3. Enter your Legit Info in the form
4. Click Next, and follow this image,(not exactly, but as a Example.):
5. Choose your Poison 
6. create a story that goes along with your "defected Product"
7. wait for a response 🙂
now you can try this for 1 can, or a whole pack. It is up to you. I have done this myself and it worked 🙂
Proof:
and other sites you can do this on:
Starbucks
Mcdonalds
hostess Cakes
KFC
Lays
Monster
Red Bull
February 17, 2015 8:00 am