Robin: I do not love Don.
Marshall: Robin, neurologically speaking, the part of the human brain that makes you hate people is located right next to the part of the brain that makes you wanna jump people's bones. The two responses are so similar it's hard to tell them apart.
Ted: You know what it's like? Wait, I have to get a book. Give me 30 seconds.
[Ted rushes out of MacLaren's. He returns 22 minutes later:]
Ted: Okay, this is fun. Look at this picture. It's a rabbit. You can look at it for hours and be absolutely sure it's a rabbit. But then one day, you look at it, and you realize, "Wait a second, it's a duck." It's a rabbit. It's a duck. Rabbit. Duck. Rabbit. Duck. Isn't this fun?
Future Ted: [v.o.] It sure was.