"That The Eagles Could Have Carried The Fellowship To Mordor And Circumvented The Whole Plot Of Lord Of The Rings"
"Sauron has flying things, too. And a bunch of giant eagles probably wouldn't go unnoticed and just gotten torn and/or shot out of the sky and the crash site thoroughly investigated.
(And yeah, if you've read the books, you know the eagles are sentient and probably would have refused. But I also get that's not obvious in the movies. So I try to confine myself to the films when talking with someone who's only seen the films.)"