Thing is they have their own stunts.
This morning at a junction again a bike rather than taking the same approach as everyone else decided to try something different.
I would have to explain the junction as its a little odd. Imagine a normal cross road, but due to traffic the road that runs from 9 to 12 is deemed the main road, and the junctions at 3 and 6 are the joining ones.
I pull up at 3 oclock to join and head to 9, so straight on in effect. I am behind 2 vans doing the same, and at 6 oclock wanting to head to 12 is a bike. As everyone is joining the road, the two vans both look right (to 12) and join. I pull towards the line, look right and as nothing is coming, join the road, I don't ever stop.
For some reason the bike has decided rather than wait for me hes going to go, in effect cutting my path to join the road (actual crossroad is slightly offset), so I go and hes almost managed to get his front wheel in front of me, so he brakes hard and waves at me

I wasn't joining slow, I was in fact at about the same speed as the vans, around 5-10 mph.
I guess he just didn't want to wait any more. In years I have never seen anyone else attempt this (cars, vans, tractors, dust carts, etc etc), you give way to the right and thats what every single vehicle driver I have ever seen has done. First bike I come across at the junction and he tries something different.