[Roger Darthwell]

It's usually football overruns or the President deciding he wants to make a speech that will see content "pre-empted". Nowadays I think the networks are a bit more flexible and will run a few minutes late but in the past it was not unusual at all for shows to just join a network show that was already in progress - so you might miss the first 10-20 minutes and then join the show. Otherwise shows might be bumped to overnight, which would often be 01:37 or 02:07, one the network late chat shows were completed. Digital sub-channels tend not to be used in the US as they're usually leased out to third parties, but in Canada now if a show can't air on the main network it will likely air on a digital off-shoot.

As a follow up to my previous question, and this is something that just came up in my mind, you have mentioned Canada, which simulcasts loads of US TV programming, so to put an example that you have said Brekkie, if the US President wants to make a speech and a programme is interrupted in order to cover that speech, and at the same time it is simulcasted in Canada, does that mean that Canadian viewers will also see the coverage of the speech of the US President in that particular moment?