Sort of like how Batman and the Joker created each other

This past Sunday, Doonesbury alluded to a hazing incident at Yale that occurred in 1967 (when both Trudeau and George W Bush were students). Interestingly, this article implies that Trudeau's first published cartoon (In the Yale Daily News) was about this same incident. So had Bush gone to Harvard for his Undergrad, Doonesbury might never have existed...

It's that creaky loom of destiny at work.