Second-tier Dunfermline Athletic reached the Scottish Cup final for the first time in 19 years after beating bitter local rivals Falkirk in a penalty shoot-out after a tense goalless draw at Hampden.
The side from the opposite side of the River Forth become the Pars' third Premiership scalp on their way to facing either Celtic or St Mirren in the final on 23 May.
Falkirk's Ben Spencer fired the first spot kick off a post and Liam Henderson had their second saved by goalkeeper Aston Oxborough.
And substitute Tashan Oakley-Boothe fired home the decisive spot kick to send the Championship side's fans into wild celebrations at the national stadium as manager Neil Lennon kissed the hallowed turf.
Dunfermline have not lifted the Scottish Cup since 1968, but there was plenty of experience of winning the trophy on the touchline.
Lennon has won the Scottish Cup four times as a player and four as a manager.
The wily former Celtic and Hibernian boss had rotated his squad in the two league games before this and sparing all but one of his starting XI against Airdrieonians on Tuesday perhaps contributed to their energetic start - and strong finish.
The second-tier side were able to limit the opportunities falling to Stewart - who had scored six in his previous six outings - while equally influential winger Calvin Miller was increasingly kept quiet after a dangerous opening half hour.
As Falkirk looked to reach their first final in 11 years, they had their own wealth of experience on the bench, with manager John McGlynn having himself won the cup as assistant with Hearts.
He had made two changes in defence after last weekend's 6-3 capitulation to Rangers and they took time to settle at the back.
It looked like their greater quality would win the day, but the determination of their opponents decided otherwise as they secured revenge for their 2009 semi-final defeat by Falkirk - and a first win in six of these "Kincardine Bridge derbies".
It also whets the appetite for a potential head-to-head in for Lennon against managerial mentor Martin O'Neil in the season's finale should Celtic beat St Mirren on Sunday.
Dunfermline manager Neil Lennon: "I thought we were great. It was attritional but we had the better chances. You could tell the pitch and the occasion was getting to both sets of players.
"It's a hell of an achievement for the club. These players have covered themselves in glory all the way through this and now we have one to go.
"I haven't told the players the bad news yet - they are in tomorrow for recovery. The one thing about this lot is they can fall off a cliff quickly, but they are talented and it's so exciting.
"What this will do for them and the city - I'm lost for words."
Dunfermline goalkeeper Aston Oxborough: "These are moments you dream of. I thought we were comfortable in our shape and it was a brilliant shift from the lads.
"There's lots to play for. It's such an exciting time to be at Dunfermline."
Dunfermline midfielder Matty Todd: "It wasn't a pretty game, but you could smell the Falkirk team were nervous.
"Ever since the manager has been in the door he's been wanting us to take us to the top flight - that's the goal, but days like this don't come round too often."
Falkirk manager John McGlynn: "We got here by beating Hearts on penalties, so I don't believe it's a lottery. I'd be more concerned by not scoring a goal in 120 minutes.
"We didn't produce that quality in the final third of the pitch. It didn't click and that's frustrating.
"I thought it was scrappy. Balls getting kicked up in the air. Probably a bit of nerves coming in if I'm honest. It's very frustrating and painful."
