alt Hacker NewsWow, throwback to running MacScheme (I think) on the university's Macs in a computer lab in the mid-90s. It interpreted main keyboard Return differently from numpad Enter, which to me (coming from the Amiga) was very confusing.
If I recall correctly, only Return caused an evaluation attempt, while Enter merely added a line break for readability.
That would be incredibly handy for chat bots - the number of times I’ve accidentally hit return and then has to interrupt the bot so I can finish typing…