Help me find an episode!

[Deiki]

I think I have watch every single subbed Conan episode ever released. Thinking back about these 500+ episodes, there's a single episode that (I don't know if it is because it's my favorite episode) had its presence in my memory for a while now. I can't seem to remember any lingering details except for the phrase, "when you have eliminated the impossible, whatever remains, however improbable, must be the truth." I always thought it was of Detective Conan-origin...

Anyways, to the point, does anyone know which episodes has that phrase in it? I plan on rewatching that one. From my memory, it was a very dark or tragic episode, but that is all I remember 

[Jd-]

A lot of episodes have that phrase. 238-239 or 240-241 had it if I remember correctly, as did one of the 500's? And 300's?

And the quote is of Holmes origin, in case you didn't work that out yet (couldn't quite tell from the tone of your post). The quote itself was used in The Bruce-Partingon Plans, The Blanched Soldier, and, originally, in The Sign of Four.

[kkslider5552000]

222-224

[xGinx]

I think that pharse is said in the Siren's Case.