“I present to you my new time machine,” Mr Malclan said to his assistant.
His assistant looked at the rather uninspiring blue box, “Really?”
“Yes, really. Quick jump inside, there’s no time to waste.”
“But isn’t that the whole point of a time machine? Going back in time so you can waste your time watching every episode of your favourite TV series instead of studying for that test?”
Mr Malclan gave his assistant an unimpressed look as he opened the door and ushered her inside. “What do you see?” he asked from outside the box.
“Nothing. There’s no light in here.”
“Get out your phone and tell me the time.”
“Three past five.”

A minute later Mr Malclan said, “Okay, you can come out now.” His assistant came out of the box looking very unconcerned. “Now, what time is it?”
“Three past five…”