There's no secret why a funny ad performs well: it's sticky. When people really enjoy an ad, they want to share that enjoyment with other people, either by telling them directly, showing it to them, posting it on Facebook, or retweeting the heck out of it. Here's our pick for the top five funniest ads from 2012. If we missed your favorite, share it with us!

Rory Scovel's Nissan ad. Skyrocketing stand-up comic Rory Scovel stars in this quirky, quick ad that barely even shows the car it's advertising. Scovel's subtle physical comedy does the job countless other ads spend time screaming about.

Will Ferrell's Old Milawukee ad. Shown in an incredibly small market in rural Nebraska, this Old Milwaukee Super Bowl ad is way more of an inside joke to advertisers than the audience who received it. But anyone who knows the Super Bowl ad rates has to laugh over Ferrell's leisurely stroll toward the camera.

Charlie Sheen's DirecTV ad. No disgraced celebrity in recent memory has parlayed his or her nefarious status as quickly and as strongly as Charlie Sheen. This ad is just one of a series of surprisingly funny DirecTV spots, which feature common situations getting out of hand.

Audi's 'Vampire' Super Bowl ad. Taking a fun poke at the vampire craze sweeping through books, movies and television, this ad shows shows how powerful the Audi's headlights really are.

Little Ceasar's 'One Rule' ad. Sometimes brevity is key, and this short spot gets a big laugh and then gets right out of there.