Merseyrails 507 & 508's have a fascination with Sandhills. They will regularly get stuck on announcing that the next station is Sandhills, we are approaching Sandhills, and that this train is calling at Sandhills. Even when Sandhills was closed, for the first few weeks they never bothered removing it from the list and it was regularly overridden by a guard.
They also have a few extra announcements: "Please move down the train to make space for passengers getting on", "Pickpockets may be operating on this train, please take care" and the oddly-common "Due to a fire at the next station, this train will not be stopping at xxx" (and not once has the train not actually stopped at the supposedly burning station). There are also plenty of delay messages, but these are pretty rarely heard as the guards usually just announce them instead.
When the refurbs first entered service, they had a period of constant changes, probably to test what worked. To start with, they had no voice announcements, just "BING BONG" every time the screens updated. Then the voice was enabled and was incredibly loud for a while, then too quiet, then they removed the bing bongs and raised her volume a bit. It was also apparent that the guards were still learning the system, as you would constantly have the wrong messages played, usually a few in succession until the guard gave up and just did things the old way.
We also have the 'grumpy' guard, who quite often announces that, because he is bored, he will be along shortly to check tickets. He also rants about his mother in law, usually giving everyone a wry grin.
I've always thought they should get local celebs to do some of the automatic voicework on the trains, would certainly have been nice for culture year...."Sandhills my arse!"