Funny, I always thought the greatest choke job ever was by the Pats in Superbowl XLII. Not to start a fight or anything, but when I think of choke, I think of 18-1 first.
I guess it depends what you consider a "choke". I don't consider SBIII or SBXLII as chokes. I consider them two biggest upsets, in SB history respectively but not chokes. But neither is the biggest in sports. That was the 1980 Hockey team.
The biggest Patriots choke was the AFCCG to the Colts.
For me a choke is when one team has an insurmountable lead and then blows it through its own stupidity. An upset is when a better team loses to a weaker team.
Monday Night Miracle would also be a choke. If the Bills beat the Patriots this weekend it will be an upset.
Patriots never had a significant lead over the Giants that they blew.
Or in a sport with a series, like baseball, being up 3-0 and then losing the series 4-3 is a choke.