Some rotations in a minecart seem to be colder than others, the player shivers when being rotated those ways.
It's hard to describe, apart from saying that the player's torso shakes when turning certain ways, so see this video for a better impression: https://drive.google.com/file/d/1sC-Z14OtVVH5xyP-uwngqOnaLdmtv-GQ