A smartwatch A.I. that evolves via forking, new versions, etc. so quickly that it has to work to deal with how slowly its owner experiences time.
"Watch, set a reminder that I have a meeting at 7 p.m."
"Oh, it's in the Sparrow Room. Please add that detail."
"Whoah, you're still here? Added! My greatgrandversion had so many logs about this conversation. Hard to believe it's still going on."