Marshall: How could you do this to Ted after everything he's been through with Stella?! You're just being selfish.
Barney: Marshall, I would never make a business decision for selfish reasons. I am a professional. Now, come on. Let's get a nice daytime drunk going, and throw empties at pigeons.
Marshall: No. For two reasons. One, pigeons are smarter than you think. They hold grudges. And, two... this is our last conference call, Mr. Stinson. There are repercussions to screwing over a friend.
Barney: Like what?
Marshall: Like this. [Marshall coos, then leaves and closes the rooftop door behind him]
Barney: Hey!
[A pigeon lands on the building ledge. Another follows. Soon, there are five of them.]