If you're talking about "suffering" from a false sense of hope, then Cowboys easily top the list(NFL). The past 3 years alone have been brutal, 3 straight week 17 loses that would've clinched the NFC East Divisional Title if the Cowboys were to win.
In 2011 we were sitting at 7-4 from a 4 game winning streak looking at the playoffs,
then the Dallas Cowboys showed up and went 1-4 out of the last 5 games missing the playoffs. Record 8-8
In 2012 we were sitting at 8-6 looking pretty good for the playoffs and well in control of our destiny,
then the Dallas Cowboys showed up and went 0-2 in the remaining games to miss the playoffs. Record 8-8
This year we were sitting at 7-5 looking pretty good to win our division,
then the Dallas Cowboys showed up getting blown out in Chicago, choking away the GB game, and literally throwing away the Divisional title to the Eagles. Record 8-8
It's like Jerry Jones sold his soul to the Devil, the way we choke is a feat second to none, it's so sad that you have to just laugh at it time from time so you don't drive yourself crazy. I swear, if you gave the worlds #1 Dallas Cowboy hater a script to write for Dallas to fail, he couldn't even come up with the ways we choke, it's mind blowing and very frustrating.
-------------------------------------------------------------------------------------------------------------------------------------