Just remember the story of the first officer for a charter airline who was caught a couple of years ago. He had allegedly invented a whole military flying career, on the back of which he ended up right seat of a Boeing or Airbus. Rumour has it that the questions were asked when he went for a Command Assessment course and one of the training captains came from the same squadron as this bloke had chosen to adopt...!
Checks were made and the whole thing unravelled. Another version I heard was that he was STILL inventing flying hours in his new job and got caught through false expense claims. Apparently his logbook was a work of art including all the necessary military flying checks countersigned etc!!
Another one was a guy who made up his night hours to get his ATPL (old style). A quick query to the flying club showed the aircraft actually flew in broad daylight.... End of a promising career.
But apart from the risk of getting caught, why would you want to falsify it?? It's ultimately YOUR life on the line if you profess to have more experience than you really do.
