That episode when...

[Wooneh]

Conan was kidnapped. By that nice guy who thought he murdered somebody.
And another when Ran stabbed conan with a pen.

[sstimson]

One of these might be the cases anime of 547-548 Two Days with the Culprit

Have to get back to you on the second.

Got It. Amine 92-93 The Fearful Traversing Murder Case

Ran shows how an left handed attack from the back could be done by a right handed person.