Unenthusiastic Surprise Party Response

We all know and upendo our too-cool-for-you characters. They're Marafiki with wewe and upendo you, even though they find it rather hard to onyesha it.
So let's say this person has a birthday coming up and his Marafiki decide to throw him a surprise party. What do wewe think would be his reaction once they yell SURPRISE!?

I know that he's both happy as well as annoyed that his noisy Marafiki did this without his consent. And he won't be rude to them, cos that would be..well, rude.

wewe can give a simple explanation as an answer, au wewe can write a sample scene. Thanks for your help in advance!