In Midnight in the Firing Line, we learn that Daffy Duck Cartoons are his **second** favorite thing

> Afterward, if you like, you can stop by my quarters and I can show you
> my favorite thing in the universe.
> 
> Okay, okay, my second favorite thing in the universe.

The implication being that having sex is his absolute favourite thing.

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On the excellent [Midwinter site][1], JMS points out that Garibaldi's third favourite thing is *whatever* the woman is having, essentially that he's just using it as a pickup line:

> Basically, Garibaldi's third favorite thing...is **whatever the member
> of the opposite sex is having....**


  [1]: http://www.midwinter.com/lurk/guide/028.html