Town boss Nathan Jones hailed his side's win over Wycombe as a "fantastic three points" as the Hatters moved up to fourth in the Sky Bet League Two table.
Adebayo Akinfenwa gave the hosts the lead when he headed in midway through the first half, before Joe Jacobson fouled Danny Hylton inside the Wycombe penalty area in the second. The ex-Aldershot striker got up and took the spot kick, but stopper Scott Brown saved it to maintain his side's lead.
Captain Scott Cuthbert poked home from close range right at the end of normal time to bring the game level, before James Collins' back stick header in the eighth minute of added time sealed a remarkable victory for Jones' side.
The Welshman said: "A fantastic three points. We were nowhere near in the first half in terms of competing and how we went about it. We couldn't really handle Akinfenwa.
"We didn't do the ugly side of stuff and credit to Wycombe, they put a lot pressure on you, everything goes into your box, but we are having to get used to that because of what we are coming up against.
"I am disappointed with the first half, I really am. I am really going to have to think about my team selection next week to be honest with you. I might just have to play a team full of workers and then bring the footballers on.
"But look, I can't take it away from a wonderful, wonderful afternoon. Bearing in mind we missed a penalty – a clear one, it could have been a sending off.
"As I said though, what a win. I am delighted for the fans with the atmosphere they created, they had to put up with a lot. They were brilliant, I am absolutely delighted for them."