You Played Yourself
In the Army, a dude in my squad once convinced most of our unit that we were slotted to return to our home base a month ahead of time. The con started with him messing with another platoon. Soon it spread to the entire company, and then it was battalion-wide.
It got to the point where Platoon Sergeants believed it. The best part? He totally forgot that he started the rumor and got mad when it was addressed a couple of weeks before the supposed departure. After a bit of piecing the game of telephone together… He realized that he was mad at himself. Story credit: Reddit / wodiesan