I love the Geico commercials with the Gecko. His accent is just too funny coming from a Gecko.
"It's fish n chips....Fo free! Fish n chips. Who wouldn't want free fish n chips? I mean it's fish n chips. Fo free...The fish n chips."

And then the one where the Gecko is doing the talk show. Talking about "It's entertainin' telly-vision."

Oh!!! And the one where the Gecko is riding in the front passenger seat of this old beatup car with this guy...and the Gecko is all cool with his head bobbing along with the music and he's got shades on.

And the Gecko in the pickup truck where the music is some guy whistling and the dogs in their pickup trucks are looking out the windows all serene like...and then in the next scene, there's the Gecko chillin in the window like the dogs.

Ummm...Geico.com has tons of gecko paraphanila on sale and lots of webpages dedicated to my favorite gecko. I <3 Geico!

Ok...LOOOONG time since I paid attention to commercials, but my favorites were the old Wendy's little old ladies "where's the BEEF???" or their chicken ad describing competitors chicken products as "parts is parts!" Then any of the "GOT MILK?" series...I would stop what I was doing to watch those

I like the newer volkswagen car accident ads. Not as in funny-ha ha, but as in "OMG, an accident can happen so quickly" It reminds me that even a second not paying attention could cause an accident.
http://www.slate.com/id/2141286/

Boy, speaking as someone who got into a real doozy a couple years ago with a twit who pulled in front of me (with me going 50 or so), these ads really scare the poop out of me!

But, brilliant marketing.

My son chases his girlfriend around doing an imitation of the crab in that commercial...it's hilarious.

My Hubby and I like the "life comes at you fast commercials" especially the one with the little boy making a robot in the garage and the robots laser eyes shoot and start blowing things up including the family car.

My fave is an older one. I can't remeber the ad sponsor, but the wife is picking out clothes in the closet and the husband who is already dressed is sitting listening to Eric Clapton's "Wonderful Tonight", he repeats the part of the song where it talks about "she's deciding what clothes to wear" and she sticks her head out the door and tells him to knock it off.