A downbeat Richard Money believes the Hatters' 3-2 home defeat to Ebbsfleet United is one of the lowest points of his football career.
And the Town boss - renowned for his upbeat attitude - was quick to apologise to the 6,500 home supporters who witnessed their fourth home reverse of the season.
In a frank, muted and lengthily discussion with Hatters Player straight after the final whistle he said: "Honestly I can stand here and say I apologise for our performance this afternoon.
"I am just as embarrassed, angry, low and frustrated as they are feeling right now.
"I usually always try and finding something good to draw on and I'm a manager who likes to defend his players.
"But today they are totally indefensible, it was unacceptable.
"I've been in football since I was 16 but I cannot remember feeling so low, or angry, frustrated and disappointment as I feel right now.
"We warned the players beforehand and told them that three points today would have got teams above us looking over their shoulders.
"The teams that played in FA Trophy today will have seen our result and feel like they've won the pools.
"Today was a ridiculous situation but take nothing away from Ebbsfleet, because they've come here and done extremely well.
"We shot ourselves in the foot. It wasn't as if we weren't in a winning position because we had the lead.
"Liam Hatch has played them on his own.
"We were 1-0 up and not playing well but you think we'll get to half-time and see this out and regroup but to lose those two goals in that short period is just bizarre.
"Everyone will have seen how I felt because I left the dugout before the half-time whistle and waited for them in the dressing room.
"In the second half we gOt on top and equalised and you think we'll go on and win it but 90 seconds later and we lose THE worst goal you can imagine and then we've got another mountain to climb.
"We decided to go with the same XI that started the second half and did so well at Histon because as a manager although you want to freshen it up, you want to get to a stage where you think to yourself 'that's the team' and a win today would have meant we could have gone to Barrow with the same group full of confidence.
"Today's performance means it'll be a difficult team to select next Saturday.
"We changed the shape at half-time because we were getting outnumbered in midfield and were second to every ball, they were dominating and we couldn't pass it.
"We felt it was the right decision but you can't legislate for what happened for the third goal."
With so many games still to cram in between now and the end of the season the Hatters boss was more than disappointed that there is no midweek game this coming week to put things right straight away.
"I think of all weeks you want a game, next week would be the one," he said.
"It's like falling off a bike: you want to get straight back up again as soon as possible and make things right.
"It means we'll have to get back on the training pitch but football has a habit of kicking you in the teeth and we'll dust ourselves and go again next week."
Following such a disappointing result, the manager admitted he is now looking for his coaching staff to haul him out of his despondent mood.
"Every defeat hurts," he said. "But we've got positive backroom staff and they are all bubbly characters.
"Sometimes they've got to pick the manager up.
"It's a great job and a privilege for me to be managing Luton Town.
"The downside to being a manager is when you lose, and today may take a long while to get over.
"This will probably be more difficult to overcome but we will."
It was the Hatters' fourth defeat of the season at Kenilworth Road following losses against Stevenage, Rushden and Kettering.
And with a much healthier away record, Money suggested that his players maybe be freezing on the big stage when playing in front of an expectant home crowd.
"Having 6,500-7,000 people through the gate each week should the icing on the cake," he said.
"But it appears on some days it's like a monkey on our back and we've got to do something about it.
"I think the players at times are finding it hard living up to the expectation.
"Today was a big game and we'd just won three games on the bounce so it's just as much failing to live up to expectation than being complacent."
The injury to goalkeeper Kevin Pilkington also added to the manager's worries after he hobbled off injured with the score still at 0-0.
The early prognosis on the on-loan Notts County stopper is not good and Money revealed that Mark Tyler's return may need to be brought forward.
