What? It's hooman childeh's birfday party...? OK, I reddies now!

Helmets maek ebberyfing safer.

Love LOLcats? Who doesn't?! There are so many more over here!

Happy birthday, Maru! Thanks for five years of heartwarmingly hilarious videos!

Also, come back later today to see a video featuring the best Maru moments from the last year!

No time to explain. Just put on the hats and act casual.

It's not just kittehs that love captions! ALL THE ANIMALS DO! Check out Animal Capshunz for MOAR!

Are I what you wanted for your Birfday?!

She had eyes... eyes liek a doll's eyes...

Love LOLcats? Who doesn't?! There are so many more over here!

Birthday? Whose birthday? It's MY birthday? Yaaaaaayyyyyyyy!

planing yer goggie's birfday can b fun!

Cyoot puppehs and funneh goggies: I Has a Hotdog has 'em all!

Have you ever seen anyone so overjoyed at their birthday?

Life's too short to avoid the *SPLORT*! Visit Daily Squee for your daily cuteness!

Ohai, Cheezfrends! Today "I Can Has Cheezburger" turns five! WAT?! FIVE WHOLE YEARS OF HILARIOUS AND CYOOT KITTEHS???? SRSLY?! Time flies when you're having LOLz!

To celebrate, we've asked the employees of Cheezburger to select some of their favorite LOLz from the last five years. We've compiled them here. Enjoy a stroll down memory lane. If you want to play along, share links to your favorite LOLz in the comments below! (Or you can just wish us a happy birthday. That'd be awesome too!)