It's actually unbelievable but there are guys flying for well known European airlines making silly noises on 121.5 all the time, generally over Spain/ Brest area. The main issue is the number of lost com calls happening, I would estimate once every 15 mins over Central Europe you will Sudanly have chatter or aircraft relaying a new frequency or an accidental handling call. It's always been like that but the volume has increased with the number of aircraft in the sky. Of Course you have to monitor 121.5 because it might be you that has lost Coms!! flying over Germany in the cruise where you have a frequency change every 3 -5 mins combined with trying to brief an approach and cabin crew calling you up, sometimes I have 4 voices at once to listen to, it's no wonder there are lost coms all the time and then more chatter on 121.5 to get them back.