Note. Don't spoil the fun / Don't be such a party pooper / Don't be such a wet blanket.
A. There is no way I'm going to agree to the terms of this contract.
B. Let's meet each other halfway then.
A. Why do you look so worried.
B. I think something bad is about to happen. I can feel it in my bone.
A. I don't want to go to the beach today. Just go without me.
B. Oh, come on! Don't be such a spoilsport.
A. It is true that Jack and Mike don't get along very well?
B. Yeah. For some reason, they are always butting heads with each other.
Source From Here Preface While I don’t consider myself a functional programming guru, all those hours spent in Haskell, Lisp and Scheme...