...is when the train you normally catch is cancelled, though the one due before and the one due after are running normally
...is being told by the station announcer that a good service is running, even whilst the train that was cancelled was due to arrive
...is having to fight your way down the stupidly narrow stairs from Metropolitan to Bakerloo platforms at Baker Street because of the congestion caused by the train being full because the one that you wanted to get was cancelled even though you were assured that a good service was running
...is finding that the normally dependable Bakerloo is running with gaps, that the platform is crowded and that waiting for the next train is not really an option because by then the platform will have filled up.
At least I had the option to switch to the Jubilee, where the trains were coming in without gaps and I was actually able to get a seat at Baker Street. So at least some sort of happy ending. I was going to write a song in popular beat combo style on the subject of a general dislike of Mondays but I believe a musical ensemble operating in that idiom may have beaten me to it.