(A man approaches the counter.)

Me: “Hello, sir, what can I get for you today?”

Customer: “Yes, I was wondering what days you guys are closed.”

Me: “We’re open everyday.”

Customer: “Yes, but which days aren’t you open?”

Me: “None. We are open every day.”

Customer: *irritated* “Are you deaf? Which days AREN’T you open?”

Me: “Sir, we are open on days that end with the letter Y.”

Customer: “Right! So you’re open 4 days a week! Why didn’t you just say that?”