I think it depends a bit on what you did.
If you didn't do what you said you were going to do and you tried to publish it and you got caught, you would probably lose your appointments and you wouldn't get funded. I mean, this gets to be close to fraud and things of that sort.
It's not something I would have ever done, so it's hard to answer the question. Of course, you can read on the front page of newspapers from time to time about somebody who has made it all up, and they've never come to a good end.