..just that I've experienced personally in the last 10 minutes. Let's count:

Logged in as somebody else (2 different people!)

Showing the notifications from one of those two when that was fixed.

Out-of-sync logged in/not logged in between sidebar and post

Possibly related to that, hiding my post tools

Failing to post my message and genuinely not posting it

Failing to post a message and actually posting it

Signing me out at random and then back in

Time travelling

Arbitrary hiding of individual posts

Clicking through to a post when I tried to just recommend

Holding notifications (not clearing)

Failing to cursor lock (so hitting backspace goes back a page).

Okay, that's about a *full* dozen. Kinja, what in the actual fuck?