I think so. It's very strange. It's ironic or sarcastic or humorous. It is certainly "black humor." Aha. Google finds http://www.springfieldspringfield.co.uk/view_episode_scripts.php?tv-show=two-and-a-half-men&episode=s02e19 She threw a piece of toast at him. It hit him in the eye. He got crumbs in his eye. His eye got irritated. She took him to an eye doctor. He was treated. He wants to get home. She wants to stop for coffee. She offers to buy him coffee. That's why he says "I [will] get a free cup of coffee." He is joking--it is a pretty angry joke. He says that if they stop for coffee, the toast crumbs--or maybe the pus running from his eye? will attract pigeons. The pigeons will peck him in the eye. They will feed off the crumbs or maybe the pus. He says it is like a deal. He gets his eye pecked out and in exchange he gets a free cup of coffee.

This a dialogue from a sitcom: Can't we just go home? If I gotta drag you to the doctor at 8 in the morning you can cool your jets while I get coffee. I must look like an idiot. Wish I could tell you different. You're the reason we went to the eye doctor in the first place. You said, "Throw me a piece of toast. " I threw you a piece of toast. Two cups of regular coffee, please. - My treat. - Oh, that makes up for everything. Pigeons can feed out of my eye socket, but I get a free cup of coffee. Just the coffee. Keep the change. I'm gonna need your help until I get this patch off. This seems to be a conversation in a coffee shop following an early-morning trip to the doctor. One of the friends has a patch over his eye. It appears that the speaker has a damaged eye because the friend had thrown a piece of toast at him. I'm not too sure at about the pigeon reference - maybe it looks like raw meat? The kind of thing a pigeon would want to peck at? The coffee reference is sarcastic. The speaker doesn't think that the coffee the friend is buying for him 'makes up' for the injury he caused.

The sentence is just a simple statement, entirely speculative, which informs us about a liberal attitude of the author. It is rather like saying that the person does not mind a small amount of physical harm done, so long as the person gets a small reward in return. In this instance, the small reward is represented by the "cup of coffee".

More context, please!