Credit card companies love me

So a while ago I was buying something on Amazon.  They threw an offer at me: Sign up for our no-annual-fee student Visa card and get an instant $30 credit!  Applicable instantly!

Well, the total amount I was spending was $30.16.  Unable to resist such an offer, I signed up, and discovered to my joy that I could use that instant credit for the current purchase.  

I just got the actual card, signed up for the online statements, and paid my enormous outstanding balance of 16 cents.