You can never be too careful

Do you know that bit of Red Dwarf that goes "Everybody's dead, Dave.?"​

"Hello, are you open on Bank Holiday Monday?"
"Yes we are!"
"Is all of the museum open on Bank Holiday Monday?"
"Yes. All areas are open."
"And is the cafe open on Bank Holiday Monday?"
"Yes, everything on site is open as usual"
"Is the gift shop open on Bank Holiday Monday?"
"Yes. All of our areas are open as usual on Bank Holiday Monday."
"I wanted to ask as your website said you'd be open, but you can never be too careful."