T-Rex: So Theseus had a boat, and when a plank rotted, he replaced it. After years of replacing failed planks until they've ALL been replaced... IS IT STILL THE SAME BOAT??

T-Rex: The answer: yes, obviously, can we all MOVE PAST this please??

T-Rex: As there was no point when replacing a single plank caused it to stop being his old boat and start being an entirely new one, it's still the same boat. THE END.
Dromiceiomimus: But what if someone COLLECTED the used planks and built an identical boat out of them?
T-Rex: Then he'd have a sucky boat made out of garbage planks and has wasted a lot of time, THE END.

Utahraptor: This has been an open philosophical question for LITERALLY THOUSANDS OF YEARS!
T-Rex: I answered it! Boat's the same.

Utahraptor: Well, some have argued all objects extend across time as four dimensional COLLECTIONS of 3D objects, thus any INDIVIDUAL 3D object is -
T-Rex: Let me interrupt you right there: is the conclusion that the boat's the same?
Utahraptor: Well... yeah.

Narrator: IT'S ALWAYS BEEN THE SAME BOAT, PHILOSOPHERS
T-Rex: Hey, HERE'S a much better question to spend 2000 years pondering: what would it be like if trees were MEAT, and WE were made of plants?
T-Rex: WHAT INDEED, PLATO??