This could be a really, really long post I'm sure, but just off the top of my head, right here, right now, here are some of the things I just don't get...
People who pull out in front of you, then drive really slowly...
Builders and their scheduling/time estimates
People who are proud not to have read a book since they left school
'Sleep training'/cry it out
Taking antibiotics for colds/sore throats etc - and even more so the GPs that still prescribe them!
Horror films - the real world can be bad enough!
Internet trolling - get a life people!!
TV 'talent' shows
Swaddling a baby instead of cuddling it
Obsessing about 'perfect' lawns, i.e. without daisies, buttercups, clover etc
Apps for EVERYTHING
New mothers who don't even try to breastfeed
The Tory party - and the people who vote for them
Oh my , I did come up with a bit of a list!! What do you just not get?