Happened last week actually.
I was riding along a country ride very early in the morning on my way into work. I was tucked in going at a *ahem* steady pace, didn't even see the bird and there was no time to react.
SPLAT
Now I bet all of you are thinking I hit it with the bike, I wish I had hit it with my bike. Instead it flew into my helmet and at the pace I was going, it left its mark. Slowed right down, looked in the mirror and thought I was going to puke. I could see there was a mess left on my helmet and it wasn't pretty. Didn't bother stopping cause I didn't have the stomach to clean it off and I would have been late for work.
Rode all the way to work with bird "stuff" on the side of my helmet, got quite a few looks when sitting at traffic lights. No one would give me eye contact though, if I turned to look, they would quickly look away.
Got to work, took my helmet off and figured out what everyone was looking at. I nearly threw up when I looked at it, I didn't even want to touch my helmet. The whole right side of my helmet was covered in bird guts, blood and few feathers here and there. It had dried up on the rest of the ride in with lines of blood going all the way to the back of the helmet.
I walked into work with my helmet at arm's length and handed it to one of the guys and asked nicely if he could clean it off for me cause I was going to throw up. He looked at it and was like WTF happened and I told him and he started laughing and went around showing my helmet to the rest of the guys.
He did clean it for me and I'm now the bird killer in the office.