The good news for the Tigers and their fans? An American League team has scored seven unanswered runs in the ALCS before to overcome a huge deficit. The Boston Red Sox did it all the way back in 2008, going from seven down to win Game 5 against the Tampa Bay Rays, 8-7.
The bad news is that the Red Sox still lost the series. So even if the Tigers come allllll the way back and somehow manage to keep the Rangers from adding on to their lead, they still have another game to look forward to.
The other good news for the Tigers is that a team has come back from an eight-run deficit in a playoff game and won the series. That would be the Philadelphia A's, who came back in Game 4 to stun the Cubs.
The worse news for the Tigers: They aren't playing the Cubs, 1929 or otherwise.
Right now the Rangers have a 97% chance of winning according to the win-expectancy graph at FanGraphs, which gives them something like a 99% chance of going to another World Series. I guess that means that the Rangers have a 1% chance of trading for Brad Penny in the middle of this game and leaving him on the mound for a few innings.