Your Mission, Jim...

Sometimes when I've finished a cartoon or, more often than not, for a lot of the time I am actually drawing it, I have this recurring dread that I've just subconsciously nicked the joke from somewhere else (usually I think "This is a Gary Larson joke, this is a Gary Larson joke...") . This time I have the horrors that this gag was used in all three of the Tom Cruise MI: movies none of which I have seen. I just wanted to get that straight before Tom sends the goons round with the E-meters.