This once happened to me. And I fumbled my words while saying, Oh nana what’s this!! you shouldn’t have. 

Somehow she didn’t hear the “you shouldn’t have” part and thought I was complaining. 

Gave me and my father a wtf look, went in and got me a bigger bill. 

I felt so bad and confused because that wasn’t what I was saying. 

God bless her soul. Sorry nana.