Many of you out there probably spend more time with the London Underground than you do your own family.
You very quickly learn that each of them has their own quirks; their own characteristics, both endearing and - mainly - hugely annoying.
The fast furnace that is the Central line, the gentle, million-stop dawdling of the District line and the no-nonsense, all-action Victoria line.
Now Muriel Comedy has created this excellent sketch, representing many of the tube lines as people amassed to wish the Metropolitan service well as it prepares to go part-time.
We're big fans of the DLR and Central Line, but the Overground possibly steals the show.
Watch above and see how much you recognise of the personified service.