FFH, a German radio station I listen to online, has a competition going with a hidden microphone (Das versteckte Mikrofon). If you figure out where it is you win a trip for two to see Robbie Williams in Paris. (I wonder if you can go to Paris and skip the concert?)
It's a hokey contest but this graphic on the home page makes me snort with laughter. Maybe it's Friday. Maybe I'm tired. Maybe I'm easily amused.