My higher ups at work do both the Happy Friday and 'Hi XX, I hope you're well?' spiel. Depressingly, a lot of our emails are templated as we do mass sendouts, though it's funny to see that sometimes they haven't filled out the full template and haven't double-checked before they sent, before then copying and pasting and sending it round elsewhere.
Not sure if this is a trivial one or whether this is a full-on gripe, but had an issue with some tickets for something on Friday due to circumstances changing we tried to move them back a couple of months. The theatre told me to call an alternative provider, who it turns out are owned by Ticketmaster so I had to go through them. No help whatsoever. Was told I'd get a call back - never came. So call centre twats, basically. Though for every call centre twat, there's also a call centre angel - the Trainline for instance have lots of really helpful people who have gotten me out of many a jiffy trying to rectify shoddy work bookings. My bank have always been class to deal with on the phone as well.
EDIT - Just remembered that a month ago one of our managers sent a Whatsapp that actually read 'Fappy Friday' by mistake. Lucky it was i a closed group and not an email! Anyway we now have different days of a similar theme, so Tossing Tuesday, Wanking Wednesday, etc.