This Batman Cup is Not a Toy

So I got an awesome new Batman cup the other day and yesterday I enjoyed it's amazingness at being a cup while I drank sweet tea out of it and read a book. It was warm out and I was happy.

Proof

 But before I used the cup I noticed something odd on the sticker...

This cup is "NOT A TOY"

Why is THAT important enough to tell people? Do people sometimes use cups as toys and then get mad about it being broken? How would that call go? 

Yes, I would like to complain about this cup I bought. I was playing football with it and it shattered when I spiked it! What kind of sham operation are you running?

These are things that go through my head.