Faulty/on fire MagSafe power supply? Don't bother here, they'll claim it's wear and tear and try to sell a new one at ยฃ60. They're nearer ยฃ20 on eBay, new!
Use their free wifi to make free VoIP calls to your family. They don't mind and encourage such behavior and after all the very, very best place to hang out anywhere, anyway...