Neil Patrick Harris had some fun with his Instagram fans yesterday, showing off what he was up to while in vacation in Sunny Mexico.

In a funny series of pictures, the How I Met Your Mother actor showed himself in several stages of "inebriation" as he tested how many margaritas he could drink during the day.

"Last day of our Mexico adventure. Let's see just how many margaritas I can drink. Cheers!" NPH posted while standing in front of a pool, holding a book.

Fast forward 2 hours: "Margarita #12: I's the life of the party!! Everybodyone is LOVING me!!" He posted, showing a photo of himself laughing his butt off and everyone else looking rather concerned.

"Margarita #17: Maaaybeee shud take break I shud maybeee. #ifoundahat," he writes, looking passed-out on his seat.

It's there that NPH goes off the deep end. "Margarita #19: ......hic!......" he manages to post while upside-down on the edge of the pool (top photo).

"Margarita #W: I swinnin laps," he shares, face-down in said pool.

Finally, NPH enjoys a day on the beach - literally. "Magachita #3, 4 mebbe? : Bruuuglah dret scruh nuu rezzlooshun! Nigh nigh nowh. #annndblackout."

Even on vacation, NPH can't help but make us laugh.