After a weekend of rain in L.A., celebrities were hard to find -- but TMZ caught up with former SNLer Chris Kattan on Robertson Blvd. yesterday ... and boy did he have a lot to say.

The star chatted up our camera guy on his way to the Ivy, doing some one man comedy about O.J. Simpson's fashion choices, picking who he'd rather -- Paris or Britney -- and even asking if we'd be available to film any upcoming car crashes in which he might find himself.

Kattan then wished us a "Happy Jewish holiday" and scampered off.