I would say: OMG purple llama!!!!! I would then: *runs in demented circles* AHAHAHAHAHAHAHAHAHA PURPLE LLAMA!!!! Then say: ... Where does a purple llama come from? Actually, I don't care because I am currently riding a purple llama at 12 o clock in the grand national.
I actually know exactly what I would do with a purple llama. The other day, I met this woman on the bus who was, ahhhh... interesting. Her mind clearly worked... differently than other people's. She told me that "they" (never did quite get who "they" were) were trying to make her look crazy kwa telling people that she collected hair. Only she doesn't collect HUMAN hair, she collects llama hair! She has a pet llama, wewe see. A 300 pound llama (she was quite specific about its weight, mentioning it a few times). So anyway, what I'd do is get in touch with her (she gave me her name, contact information and city of her birth) and tell her I had something for her. Then I'd give her that goddamned purple llama and watch her face light up! Maybe get her to onyesha me her llama hair collection. Good times.