Falk was at his slinging best at the end, leading the Cougars on 75-yard game winning drive by throwing a 21-yard touchdown pass to Gabe Marks with three second remaining.
Falk was mostly brilliant in the second half, and great when he needed to be. Falk completed 38 of 53 passes for 331 yards and two touchdowns, both coming in the second half.
The last-ditch drive became necessary when UCLA quarterback Josh Rosen sprinted 37 yards for a touchdown with 1:09 remaining to give the Bruins a 27-24 lead.
Here's tape of the winning score:
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Washington State (7-3, 5-2) clinched its first winning season since 2003, and remained alive in the Pac-12 North title race.
Washington State's defense, though it gave up 554 yards, yielded only two touchdowns, including the last-minute desperation run by Rosen.
Trailing 16-14 heading into the second half, Falk threw a 4-yard touchdown pass to Gabe Marks midway through the third quarter to give the Cougars a 21-16 lead.
Washington State added to its lead early in the fourth quarter when Erik Powell's 25-yard field goal made it 24-16.
UCLA was unable to generate much offense during the second half until midway through the fourth quarter, when a 61-yard drive resulted in a Ka'imi Fairbairn's 38-yard field goal, trimming the lead to 24-19.
The Cougars, with 7:10 remaining in the game, drove inside the UCLA 20, only to have Jaleel Wadood pick Falk in the end zone with 3:13 left. It was the Cougars first turnover of the game.
UCLA (7-3, 5-3) final drive nearly killed the Cougars. The Bruins kept converting third down after third down until Rosen's back-breaking 37-yard run to give UCLA its first lead since the middle of the third quarter.
The Bruins led 16-14 at halftime, taking the lead with 11 seconds remaining in the first half on a 38-yard field goal by Fairbairn. Falk completed 17 of 20 passes for 137 yards in the opening half, but Peyton Bender threw the lone touchdown pass, a 7-yarder to Dom Williams.
Much, much more coming later tonight and early in the morning at Cougfan.com about this game, including notes, analysis and video. Check back often.