But if there's one thing Jay Leno is good at, it's taking it on the chin.
So who won the first battle of the ratings war?
The numbers were closer than some expected, but we do have a decisive winner, and it's…
The silver-haired host continued to own the time slot, bringing in 3.3 million viewers while Jimmy's HIGHlarious Mean Tweets and an appearance by beach buddy Jennifer Aniston were only able to garner the ABC show 3.1 mil.
Oh, well! It was still Jimmy Kimmel Live's second highest rated ep of all time, so things are looking just fine.
Besides, there's always tomorrow night!
[Image via FayesVision/WENN.]