You really should have strong guts to say a damn good lie. Literally!!

They always said... bravery, courage, facing adversity, being honest, taking flak... everything required a lot of guts. Even saying a damn good lie required guts. They did not say things like these just like that. Probably they knew. And now there is a scientific proof.

Check this link to know more.

Be careful next time when you say you have a lot of guts. People may just start trusting you less... ;-)