There is no record of whether they had to repaint the walls after his postmortem was over that day, but it wouldn't come as a surprise.
Celtic had just been embarrassed in the 2010 Scottish Cup semi-final by Ross County, who finished in the middle of the Irn-Bru First Division that season. It was Lennon's first major setback and it looked like it might cost him the chance of permanently landing the Celtic job.
The former Dundee and Rangers player was a surprise choice for the post following the departure last week of Barry Smith who left the club 15 points behind St Mirren at the bottom of the Clydesdale Bank Premier League table.
Some supporters walked out of a fiery meeting with the Dundee board on Saturday after it was confirmed that the 51-year-old, whose only previous management experience was with Clyde and which ended in 2009, would be boss until the end of the season.