Easter Eggs

I wouldn’t expect there to be too many Easter Eggs during the Flights/Betas, although it has been known to occur. There’s one Easter Egg in particular, and that’s the Mario Injured/Death Sound Effect when a character dies. Only time I’ve ever triggered it myself, was in the Halo 3 Beta. There’s been a few cases where others have also triggered it as well, but it was only in Halo 3 Beta, and Halo 2. I was wondering if it’s still around at all in any of the Halo games, and if maybe they’ll add it into Halo Infinite. Or was that more of a Bungie thing?

And besides that, has anyone stumbled on any Easter Eggs in general during their time with the past 2 flights?