Qickly, just 3 came into my mind:
-Paying all the ATC, Nav, Lights, etc. fees after doing a GPS approach (VOR, NDB is out of order since the colonials left...or stolen) during daylight while the ATC is having his praying time (not answering the radio of course)...
-Even if it's clear for the client that the a/c takes only 19 pax OR roughly 2 tonnes of cargo, they'll still try to make us loading both...
-French Air Force...