Bill Belichick, some Patriots players and the city of Boston all felt the same, weird abnormal feeling going through their bodies Thursday night ... LOSING!!!!
... and they can thank the Celtics.
The Pats coach -- sporting a snazzy checkered jacket -- sat up front at the TD Garden with his girlfriend, Linda Holliday, to watch the Celts take on the L.A. Lakers.
Sony Michel, Trey Flowers and Rex Burkhead were also at the game to support their Boston brethren.
Remember, the last time a Boston team took on an L.