Not specifically about Messi but let's look at this again...
Barcelona, trailing 0-4 from the first leg against Paris St Gemain, needed to score 5 to avoid being knocked out of the Champions League.
They pull it back to 3-4 on aggregate only for PSG to score again, 3-5.
At 87mins 27seconds Barcelona required 3 unanswered goals to avoid being knocked out (PSG would go through at 5-5, it needed to be 6-5).
........and they score 3 goals. 6-1 on the night.
Fans from both sides were leaving the stadium at 87 minutes (why wouldn't you? I mean it's all over).
I'm a Manchester United fan and remember* the 1999 final when we were 1-0 down with 91 minutes played.. so that was quite a comeback but, to come come from a 4-0 deficit and needing 3 with just a few minutes left.
Is that the best comeback in football?
* "remember" is the wrong word. I mean burned into my very consciousness.