JFK-CDG, airline to remain nameless (since we -did- get there). The pilot comes on and announces that the fuel numbers supplied by the fueler don't calculate correctly, and the gauges read OK, but we are going to sit on the tarmac while the aircraft undergoes a "manual fuel verification procedure" (presumably some guys with dipsticks). The pilot claimed this was the first occurrence of this type in his 25 years with the airline. This certainly made for an interesting flight! Has something like this ever happened to you?