Not indicating has been the fashion round here for years although indicating after performing the manoeuvre is now catching on too.
Doing 30 in a 40 zone is also traditional, you must be over 60 and in a small Japanese or Korean car*, pick a good dual carriageway in rush hour and just dawdle along, see how far you can get the tailback to stretch.
* 20 years ago it would have been a Triumph Acclaim or a Rover 214, however today's participants are the now ageing sons of those original pioneers. They are unable to replicate the cars exactly due to them having rusted away in the intervening decades; consequently they have had to go to the far east manufacturers to find suitably uninspiring vehicular replacements, Daewoo are especially recommended.
Current Lash Up:
TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.