As soon as the Curiosity touched down on Mars, it started sending back images to NASA, and the NASA engineers monitoring what was coming through were utterly startled to discover that they were seeing life on Mars. I'm telling you, no exaggeration; actual life. There were... well, people up there, some of them engaged in a competitive activity, more of them watching these others. The competitors each had a sort of narrow stick and they were using their sticks to propel a small spherical-shaped object, like a marble - one per contestant - across a big flat surface the size of a field. Eventually, one of these people (or Martians - I don't know) managed to get her marble to the far side and all the spectators broke into what can only be called song. The field was cleared, and the next thing - another event it looked like - was a new bunch of these beings running backwards across the same field while playing, basically, pianos on wheels which evidently had motors attached to them. This time, once the contestants reached the far side of the field, they had to turn round and run backwards again to the near side, but never ceasing from their piano-playing. Again, there was a winner - though it was the one who arrived back second. It seems he had played more notes than the fastest-running player, and the result is computed from some formula involving both speed crossing the field and numbers of notes played.
A third event now ensued, and this one involved two teams of eleven. Yes, eleven. The teams started on opposite sides of the field, and spread across its whole width, and they had to run at one another, each member passing his or her opposite number in the middle while shouting out something mildly rude or funny. Any player laughing was eliminated, and once one of the teams was down to five players it had lost. There were further events: hopping races, left-legged and right-legged in turn (yes, Martians are so built); leaping from a headstand position on to one's feet as far as possible away from one's starting point; solving brain-teasers while lifting weights; and much, much more.
We are told by the NASA observers that Martians are a most inventive crowd, and they never get fed up with testing themselves and one another or with watching other people do the same. The Earth versus Mars games, one day, will be something to see!