don't you call me sinister.

Tomorrow is Left Handed Day.

From Wikipedia:

Right-handed actor Gary Cooper played left-handed athlete Lou Gehrig in the film The Pride of the Yankees.

For scenes requiring him to bat left-handed, Cooper wore a Yankee uniform with Gehrig's number 4 mirror-reversed on his back. Cooper batted the ball right-handed, then ran to third base (not first). The film was then optically reversed, turning Cooper into a southpaw.