#1 seeds that almost lost to #8 seeds in the playoffs.
2000 - Indiana vs Milwaukee. Indiana escape in the pivotal 5 game series in 5 games on a 1 point win 96-95
2002 - New Jersey vs Indiana - Nets were the #1 seed and escaped in the 5 games series in 5 games in double OT to the Pacers.
Any others come to mind?