When a car approaches in traffic, it may not be in solidarity as you #Occupy Bike Lane.
What can seem an intimate gesture, as a couple of tonne of moulded metal, bucket seats and wing mirrors tries to snuggle up, can be quite the opposite.
You've been right hooked.
An appropriate gesture in response is to fold your finger tips into the palm of your hand, wrap your thumb around them, tense your hand muscles, and move your arm rapidly towards the approaching car's panel.
That's what cyclists call a left hook.
BONUS TIP: You don't really need hand bones to ride a bike, so feel free to throw that hook nice and hard.