Back in WWII, US fighter squadron pilots would often fly under radio silence. But things get lonely up there in the cockpit, so after a while there'd be a crackle of static as someone keyed his mike. Then a disembodied voice would reply, "Who dat?" An answer would come, "Who dat say who dat?" And another, "Who dat say who dat when ah say who dat?" After a few rounds of this, the squadron commander would grab his microphone and yell, "Cut it out, you guys!" A few moments of silence. Then... "Who dat?"