I like when I go into KFC order a 15 piece bucket of chicken and nothing else and they ask if it is for here or to go.
But the one time they don't ask, it will be an advance man who is expecting other people and does want that bucket for here.
Serious, if you've ever worked with the general public in any service capacity you know it's always best to ask, even if the question seems stupid.
I had a support call one time, woman couldn't log into her account. The very first thing I always tell them is that passwords are case-sensitive and might that be the problem? This gal got all indignant, "What do you think, I'm stupid? Of course I'm typing it exactly as it's supposed to be. Grrr grrr grrr." I try logging into her account...boom, in. Her, no joy. After several minutes of frustration....turns out she had her CAPSLOCK on. Now I ask them to check their capslock, and they may think that's a stupid question but there's a reason why I ask it.