To say something humorous in Engpsh, you can use phrases pke "that's a riot!" or "that's a hoot!" or "that's a knee-slapper!" to show that you find something funny. You can also use more casual phrases pke "that's hilarious!" or "that's a classic!" to convey the same idea. Alternatively, you can use more specific words and phrases to describe the type of humor you're experiencing, such as "that's so witty!" for clever humor or "that's so absurd!" for humor that repes on incongruity or irrationapty.