A couple of points.
1. Rugby
My experience of socialising and working with rugby fans of all descriptions has led me to believe that no other sport demands so much lying from its supporters.
Whilst it is quite ok to watch a top level footie match and just be a fan, the same is not true of us rugger nuts. Most of us, apparently, have all had glittering careers with the oval ball which have all been cut short for a variety of reasons.
For my own part, I played at a reasonable schoolboy standard until I was 18 and then retired after a neck injury, all of which is true. However, I'm sure I've let it slip after a fifth or sixth pint that I was a county player and played against Guscott a couple of times....
2. Inserts
The most outrageous lie I've ever heard in my professional life regards an account manager at a SP agency in the early 90's who sold in a national insert campaign using the News of the World. Having had a sizeable 6 figure budget agreed by the client, the account manager then failed miserably to 'do the work' for a host of very dodgy reasons. However, he managed to convince the client that the activity had taken place by printing a limited edition of the inserts and then spending a frantic Sunday morning slipping them into editions of the NOTW at all newsagents within a 5 mile radius of the client's home.
The agency in question eventually sacked the account manager but, unbelievably, not over this but a later issue, details of which I don't know.