A bit inspired by Dr. Who
“But Professor, you said that meeting yourself would drive you insane!” Jenny shouted.
“Yes, it’s one of many dangers of time travel, but I have no choice,” the Professor said, her hair flipping wildly as she worked the controls of the time machine. “We have failed. I have to go back and help myself or the Universe will be destroyed. Maybe this time, we’ll get it right.”
The machine dematerialized and materialized again a few dozen feet from, and a few minutes before its original position. Now there were two time machines on the platform of the station suspended above the black hole.
The Professor turned as she stepped out of the machine, “You stay here, Jenny. No sense us both risking our sanity.”
Another Professor, this one a few minutes younger, stood outside of her own time machine with a confused look on her face, “Well, clearly we screwed things up bad if you’re here. And our mind is clearly already gone.”
“What do you mean?” asked the slightly older Professor.
“In case you’ve forgotten, OUR name is Jenny.”
“Nonsense, two people can have the same name.”
“Yes, but there is only room in our time machine for one person.”
“Nonsense, it’s much bigger on the inside.”
“No it isn’t, I should know. I’m you. That doesn’t even make any sense. Just because we can travel through space and time doesn’t mean we can ignore the laws of physics.”