Motorways: Vans on bridges and those friendly chaps in the cars with the extra lights.
Country Lanes and non-urban A roads: Badgers! Big F^&*ers them!
I hit a badger a few months a go, was already dead but still massive, even on its side! (Didn't see it until it was too late because of the mk2s spectacular head light system!
It was a cold night and I had the heaters on, not for long after I hit the badger! One of the most disgusting smells to have ever come through my heater vents
Dead flesh and fur 
Had to go to a jet wash at about 1 in the morning!
Don't even talk to me about badgers! I was a passenger in a friends A4 when the car in front of us hit a badger doing about 60, the badger someone got air, sailed over the cars in front bonnet and roof came tumbling into the bonnet of our car and continued up the wind screen leaving a massive crack and blood everywhere...needless to say we nearly crashed!!
Reminds me of my very first VW show..
Spent 3 days claying, polishing and waxing, driving up a B road in a convoy I seen the car in front do a quick swerve left then right then Blam I hit a pheasant, poor thing went through the front of the bumper, took out my indicators, fogs, underscuttle and archliner got itself wrapped around my brakes and got thrown out the back of the car in a mass of feathers , guts and blood.
I must say. I felt so sorry for the poor guy behind me as he was up for the show and shine!!