One of HM's mighty Phantoms is scrambled off to CAP on an ADEX. Usual guff - Wattisham approach for 5 minutes, change to Eastern Radar for 2 minutes, then check in with Neatishead. Our heroes are Thrombo at the helm and R2 in the back.
R2 checks in: "Neat this is blah - Charlie 440,Tigerfast plus 10. Vectors to CAP?"
Back come the words from the fighter controller babe "Roger - make angels blah and vector blah blah blah"
At this Thrombo interjects "Now look R2, shouldn't you really have authenticated her before you accepted her directions?"
Quick as a flash R2 replies "Authenticate her? No need for that, mate - I've $hagged her!!"