What is something that could happen in MLB that you would think is cool?

Pitcher throws a no-hitter, loses game to pitcher throwing perfect game.

Pitcher gets 3000th career strikeout in same game he wins No. 300 (if he struck out the last batter for No. 3000 to earn No. 300... that'd be really something).

Hitter essentially does the same thing, his 3000th hit is also his 500th home run. Really, just having it so that they're close enough to each other that everybody speculates whether or not it will happen, that could be fun.

Probably a lot of other stuff, that's all I can think of right now that would be memorable enough for future generations to talk about.

Seeing a pitcher strike out the side on 9 pitches or a pitcher who strikes out 4 or 5 batters in one inning. (As a result of a hitter reaching base on a dropped third strike). Also seeing a batter homer from each side of the plate in the same inning is another cool event to witness.

2 to 2 in the second inning, 2 on, 2 out 2 strikes and 2 balls on the batter in the second game of the season between two second place teams.

An unassisted triple play by a third baseman who later hits a triple. Also, a walk off inside the park grand slam.