These are obviously not the greatest of examples, considering these were against the Celtics and both teams ended up losing in 7 games, BUT, hear me out:
2008 Atlanta Hawks and 2008 Cleveland Cavaliers. If I recall correctly, we absolutely slaughtered both teams in the first two games on our homecourt, everyone says they're done, etc. Both teams tie the series up at home, push it to 7, and eventually fall to us and the rest is history. The talent disparity between those Atlanta and Cleveland teams vs our 2008 championship Celtics was enormous.
The point is that an 0-2 deficit is hardly a death sentence, especially when we the losses have been on the road and about us not executing. And pay no attention to the end results of those 2008 teams, because the Celtics and Heat of this year are much, much more evenly matched than those teams.
Edit: One more piece of history. The Spurs came back from an 0-2 deficit in 2008 against a very good Hornets team, led by Chris Paul, who many people feel should have won the MVP that year. Dropped the first 2 on the road and won in 7.
We're hardly out of this. Go C's.