Japanese Lesson:
Han=半=Half.
Ji=時=Hour
JiHan=時半=Half-Hour.
Ergo, Tantei-han could translate to Half-Detective.
...
"Ya know," Hattori observed, "KID calls meh 'Tantei-han,' but if anythin' shouldn't you be Tantei-han?"
Conan's brow furrowed. "No, why? He calls you that because 'han' is a common pronunciation of 'san' in Kansai dialect."
"I know dat, but between da two o' us, you're the one dat's only half a detective."
Heiji laughed before receiving a sharp retribution-kick to his shin.
...
A/N: Japanese pun. If you don't comprehend my lesson, you won't understand. If you understood, lemme know! I liked this, but it's kinda wasted on non-Japanese-speakers. *Sadness*