I have yet to work on a team where #scrum actually works.

I've watched burndown charts go up and to the right as intervening requests piled in.
I've watched engineers argue longer about the ticket estimate than they actually spent working on the ticket.
I've watched people game the system repeatedly to make the metrics look good.
I've seen metrics look awful for months at a time and the execs don't care (even though execs mandated scrum).

Does this ever work?