There seems to be a lack of funny episodes in the newer ones, so I highly recommend you go through the older episodes if you haven't already. Here's a list I managed to gather from the newer(ish) ones (and from movies and OVAs). Images of them are put in spoilers:
The Blind Spot in the Karaoke Box (507-508)
The Alibi of the Black Dress (575-576)
There were some really good moments from Movie 8
Movie 9 as well
A Small Client (354-355)
Teitan High School’s Ghost Story (361-362)
OVA 11
oh, and basically every episode with Heiji in it
...which can be found here:
http://www.detectiveconanworld.com/wiki/Heiji_Hattori_Appearances
Those were all from the top of my head. Like I said before, the older episodes typically have a lot more to offer in comedy. You wouldn't want to miss these, right?
Kogoro's Class Reunion Murder Case (27-28)
The Kidnapping of a Popular Artist Case (81-82)
The Strange Person Hunt Murder Case (13)
There are a lot more pictures, unfortunately, it's harder to track them down since they're from older episodes. But you get the gist, heh.
Happy watching!