I'm a big fan of the rain drops on screen effect in racing games.
Some examples along the history:
Rad Rally (Sega AM2, 1991). Probably the earliest example of this effect being properly done.
Speedboat Attack (Criterion Games, 1997). Yep, that Criterion Games. Drops are always the same layer of animation but it still looks cool and only happens in the tail of the rivals.
Wave Race: Blue Storm (NST, 2001). Subtle yet cool effect.
Need for Speed II: Special Edition (EA Canada, 1997). I'd say the first hardware accelerated and randomized drops effect ever. They're only displayed in the Special Edition and using the Glide (3DFX) API. It also features snow pellets on screen.
Colin McRae Rally 3 (Codemasters, 2002). The first game in the series to feature such effect, and it was really cool.
Mobil 1 Rally Championship (Magnetic Fields, 2000). Another old game with good looking effect, drops varying direction/speed based on the car handling.
The Touryst (Shin'en, 2019). Another great effect, hard to tell in this GIF. It would be 10x better with voxelized drops tho.