A couple of years back in the northern part of Denmark. Unidentified target low level and very fast fooling around. To get a label on the guy to remember to give traffic info we entered "HVEMDER" - which is danish for "Who´s there". We thought it very funny, until the military were on the phone in total panic - they have direct transfer of info from our system, and they thought it was an unknown fighter with the actual name "HVEMDER"
Just close to starting war against themselves......