I guess that's it
The go-to phrase when you're too scared to say something worse and just want to make your friend feel like they're being tortured by a group of raccoons.
'I guess that's it' after his friend told him he smelled like old socks.
'I guess that's it' when he had to hear his friend's mom's bad singing for the 10th time.
'I guess that's it' after his friend made him eat a whole pie for breakfast.