Went to Barcelona last year (same weekend we beat Burnley away 1-0 on the Sunday midday) and watched them. Funnily enough I had bought tickets to see the Barcelona v Levante match 6 months before the game when we booked the trip. It turned out to be the game Barcelona clinched the title in which I was made up about - as it could be his last La Liga Title and I was there to see it.
Point of the story, I couldn't hear a Spanish speaking person around me. There were Scandinavians, Americans, Canadians, Italians, English, Africans and people from Australia/NZ just there to watch Messi. They all had Messi shirts on.
He started on the bench, and came on in the second half. The game at this point was 0-0, and when he was coming on everyone stood up- screamed with excitement, bowed down to him like he was a god and applauded him, and they did the same when he scored the winning goal. These weren't even Barcelona fans - they were Lionel Messi fans. I've never seen anything like it for one man.