oyster cards are basically like these plastic cards that you can use on different transports to get to places. For children under the age of 16, their oyster card is free...they can just scan it on a bus and get on. Whereas, adults can put money on it to use for trains/buses.
So for trains/tubes you can top up however much you want and just scan it across.
Stop pit, I have no need for friends nor sympathy. If you want to be my enemy you are more than welcome to join the line. Its not as long today as its Sunday, so hop on luv!
Please, children stop arguring. You can all be my biatchs. Right now I need lunch, first one of youse to produce it will be allowed to walk within 5 feet of me next time I grace the public with my presence.