Did you realize we say the word "the" in two different ways? We say "thuh" before a consonant and "thee" before a vowel. Try it out on these two sentences.
"I would like the other one."
"In the place I told you about."
See? You automatically pronounce the word in two different ways. It's funny, you probably didn't notice you did that. Students find this frustrating and illogical. (Quebecers often say, "I would like "thuh udder one".)
I wonder where the expression "It's the pits," came from. Is it a pit like a depression in the ground (or under the arm) or is it like the nut in the middle of a peach?
Or what about "down in the dumps"? We take old junk to the dump. Also, every morning I take dumps. This gives new possible interpretation to "Don't dump on me!"
Nowadays, I here the people proclaim, "It's the shit!" I haven't ever been particularly pleased with any kind of shit and yet, this is some kind of accolade. Crazy youngsters.