Tom Hanks -- MOVIE CO-STAR REUNION ... At Crappy Knicks Game

Tom Hanks reunited with TWO of his former big screen co-stars Tuesday night ... Kevin Bacon and Ed Burns ... and it was the most exciting thing that's happened at a Knicks game in months.

The actors all chilled out courtside as the last place Knicks took on the almost-last place Sacramento Kings at Madison Square Garden.

Of course, Hanks starred in "Saving Private Ryan" with Burns ... and shared the screen with Kevin Bacon in "Apollo 13."

Also in attendance ... the Beastie Boys rapper Adam Horovitz (aka Ad-Rock).