Duh

No duh, man.

"In less than two years, there will be a commercially-viable Internet for dogs," said Tom. "Why can't they use the same one?" asked Mary. "Because it's for dogs only! Duh!" replied Tom.

"My thoughts are very stream-of-consciousness." "Well, duh."

All I can say is, "well, yeah, duh."

"It seems like the moment Tom started doing evil stuff, you changed your opinion of him." "Duh?"

It's hot in the desert. - Well, duh!

Duhhh, I'm Jasmine, I can't even tie my shoe laces right!

Duuhh... I don't feel so good now...