Paste a Bluesky thread. It shows you the acausal version — causality inverted, so each reply appears above and before the post it answers. Effects precede their causes. The clock runs backwards. Someone started posting acausally, and this is what it looks like from the outside.
Reads only public posts (Bluesky's anonymous AppView, getPostThread).
The thread is real; the ordering is a lie. It renders one path through the
conversation — from the last reply down to the first post — upside down in
time, so a reply is shown as the cause of the post it actually
answered. Nothing is posted or changed. No causality was harmed; it was merely
reversed.