Back when I went to trial with the attorneys that I worked with in a previous life, some knew each other so well that they would exchange note cards with three words or terms (Stuff like: Hamster, Ferris Wheel, Gettysburg) that the other lawyers needed to try to work into direct or cross. Beer/Wine/Happy Hour bets and the like were at stake. Obviously, all civil cases and not super Woz type stuff.
You guys play any lawyer games in court with opposing counsel you know well?
Not necessarily a "game", but several years ago a prosecutor and I (both assigned to the same misdemeanor court at the time) had a sort of "agreement"* where neither of us would strike any decently attractive female under 35 in the jury pool. He created this game on his belief that he'd "never lose to [me] in any sort of competition involving hot girls." Despite this insistence, and probably have more to do with the fact he was a pretty terrible prosecutor, I never lost to him (4-0 IIRC).
The "game" came to a head after a trial where, despite perhaps the general facts of the case (suggesting my guilty was pretty guilty), the jury returned an acquittal in a very short amount of time. The judge, somewhat perturbed (not at me, but at the prosecutor), inquired of this prosecutor as to why in the world he didn't move to strike the girl on the jury who indicated in voir dire that her husband played softball with defense counsel and that she liked defense counsel, heard defense counsel is a "good attorney" and that she'd "probably believe anything [defense counsel] said and argued." The prosecutor indignantly claimed that he'd "take his chances against [Woz] with anything to do with women any day." The judge, just straight dead-panned, retorted, "but you've never beaten him."
I'd note this is also the prosecutor who:
1) Once gave what he referred to as the "Yoda closing." The Yoda closing consisted solely of the following three question-answer statements: 1) drunk driving? proven; 2) guilty? your call; 3) your service? appreciated.
2) Just before he left the office, sent out a large number of last-minute too-good-to-be-true plea offers which caused his boss, after learning what had happened (and the prosecutor now gone) to have to send out a letter to defense bar basically apologizing but withdrawing any of the outstanding offers which hadn't been accepted -- a huge no-no in our area of practice, but, frankly, somewhat understandable.
*Note: I would have easily broken the rules of this game if my client's best interests would have been best served by doing so - i.e. no way I was going to let this "game" create an ethical issue for me but, thankfully, that scenario never arose.