The Umpire Strikes Back

[Photon]

That look on Odo's face after he gave 9er Manager, Sisko the Heave-ho was a look of "I've been wanting to do something like that to him since he got here"
Funny as heck

 

[Navaros]

That is indeed a classic look by Odo. I notice Odo does that a lot, often when he's taunting Quark.

I also love the looks Odo gives to the perfume alien who was really an assasin. You can tell by the looks that Odo knew he was full of crap.

 

[ShamelessMcBundy]

I loved the look he gave to the Logician's manager. That was perfect!