My worst experience has to be at the Hard Rock Cafe in London. Every year, on June 14th, HRC celebrates its birthday and menu prices are the same as in 1971 when it first opened. Normally you have to wait over 3 hours in the line just to get in and then probably another half an hour for a table. But that's not what I'm complaining about. Because June 14th is like a madhouse in there, service can be be really rushed and not up to the usual HRC standards - you know, cheesy smile on arrival, chit-chat with your server - forget it! So anyway, we ordered hamburgers and when they arrived they were literally pink all through (these are quite thick burgers) so I asked the guy to send it back for one that's actually cooked. No can do he said. That was the last time I ever visited HRC.