Well, Saturday was definitely one to forget.
It started so well for Fulham after Neeskens Kebano put the Whites ahead in the rain at Griffin Park, with the side playing some really good football before Ollie Watkins tore the midfield apart and slipped in Sergi Canos for their first.
After that, Fulham rarely threatened and it was pretty much game over when Romaine Sawyers scored and Denis Odoi was sent off for a silly foul that he really didn't need to give away.
A derby day defeat usually throws up a number of talking points, and this one didn't disappoint on that front - here's what we took away from the loss at Griffin Park.
Stefan Johansen's false nine role
This one was a bit of a surprise when I got the team line-up before the game on Saturday.
We know Slavisa Jokanovic has used this formation before, and to great effect when playing away from home, but it didn't look or feel right to have a midfielder like Johansen playing that role.
It works with Floyd Ayite, he's able to interchange between the wide players and create space and cause havoc for the opposing defence, but Johansen wasn't able to do that and found himself coming deep a lot of the time to win the ball - as is his usual positioning.
You can see why Jokanovic did it - having Kevin McDonald, Oliver Norwood and Tom Cairney all in the midfield to try and exploit space and shut down the gap between the back four and midfield is appealing, but I just don't think Johansen was suitable for the role.
Once Brentford went 2-1 up the formation became redundant, and Fulham rarely threatened afterwards - I don't think Jokanovic will be using Johansen in that position again.
Denis Odoi's silly sending off
This one perhaps one of the most braindead fouls I've seen given away - Watkins is heading out wide and not really causing too many problems before Odoi bodychecks him.
It turned the game, and once he went for an early bath there was no coming back for Fulham.
What annoys me even more is that Odoi was given a warning by the ref for doing the exact same thing only ten minutes before - he needed to keep his head and he just didn't do that.
It's a shame, Odoi was having a good game before that and was dealing with central threats well, but once he got dragged out left he couldn't cope with the pace of the Brentord strikers.
It was a moment of stupidity and it cost the side dear.
Now isn't the time to get rid of Jokanovic
I still don't think Fulham should part with Jokanovic.
Yes, the performance was poor and once Brentford went 2-1 up there was little inspiration from the touchline in terms of substitutions - Rui Fonte and Luca de la Torre had no impact at all on proceedings.
But Jokanovic has his trump card that signings in the summer were poor, and now Craig Kline has left he can use that to his advantage.
If Fulham sacked him now, who would want to manage a club that is seen to impose recruits on a manager, then when they don't work out sack the manager?
We know how good a head coach Jokanovic is, he has Fulham playing good football and if they had carried on playing like they did in that first half things would've probably been different.
It's a slog at the moment, but Fulham need to keep onto the coattails of the top six for the January transfer window in order to recruit better and give Jokanovic the tools he needs to take the team back to the level he got them at last season.
Brentford played the way Fulham should be playing
As much as it will hurt, you have to give credit to the way Brentford played - they were one of the best sides I've seen all season.
After the last campaign, the way the Bees are playing is exactly how Fulham should be, fluid and full of attacking intent and threat.
We saw that from the Cottagers last season, they were interchangeable and every time the ball got past the half way line you expected it to hit the back of the net.
Brentford's passing and movement in that second half was some of the best I've seen any side produce this season, and it's frustrating because Fulham have the ability and players to do that, like they were last season.
But they haven't pushed on from the end of the last campaign and are in real danger of stagnating if something doesn't click, and click soon.