What is a cappuccino?

Okay, I was at coffee shop the other day (and not Starbucks for once) and I heard a lady complaining about her cappuccino. She seemed really ticked off that there was hardly any milk in her drink. She actually said "The ones at McDonalds have a lot more milk in them". Well no crap lady, it was a cappuccino from McDonalds. Did you really think that that is the standard by which to judge every other cappuccino? If you think that a cappuccino is some sort of advanced chemistry project that comes out of a machine at the press of a button then don't leave McDonalds and let the rest of us enjoy our real coffee in peace instead of listening to you yowling like a half dead cat in heat and be wrong on top of it.