Terry Pratchett in Lords and Ladies wrote:“Trousers of Time,” said Ridcully. “One of you goes down one leg, one of you goes down the other. And there’s all these continuinuinuums all over the place. When I was a lad there was just one decent universe and this was it, and all you had to worry about was creatures breaking through from the Dungeon Dimensions, but at least there was this actual damn universe and you knew where you stood. Now it turns out there’s millions of the damn things. And there’s this damn cat they’ve discovered that you can put in a box and it’s dead and alive at the same time. Or something. And they all run around saying marvellous, marvellous, hooray, here comes another quantum. Ask ‘em to do a decent levitation spell and they look at you as if you’ve started to dribble. You should hear young Stibbons talk. Went on about me not inviting me to my own wedding. Me!”
From the side of the gorge a kingfisher flashed, hit the water with barely a ripple, and ricocheted away with something silver and wriggly in its beak.
“Kept going on about everything happening at the same time,” Ridcully went on morosely. “Like there’s no such thing as a choice. You just decide which leg you’re heading for. He says that we did get married, see. He says all the things that might have been have to be. So there’s thousands of me out there who never became a wizard, just like there’s thousands of you who, oh, answered letters. Hah! To them, we’re something that might have been. Now, d’you call that proper thinking for a growing lad? When I started wizarding, old ‘Tudgy’ Spold was Archchancellor, and if any young wizard’d even mentioned that sort of daft thing, he’d feel a staff across his backside. Hah!”