Customer: “How cold is the Extra Cold Guinness?”

Me: “Colder than the regular Guinness.”

Customer: “Okay, I’ll try it.”

(Customer takes a sup of his pint.)

Customer: “It just tastes like regular Guinness, but colder!”

Me: “…yup.”

Related:
The Son Of Captain Obvious
Captain Obvious Strikes Back
The Return of Captain Obvious
Captain Obvious To The Rescue
Belaboring The Obvious