You know how every time you learn something new, it pushes something you used to know out of your brain? (What's that? You didn't know that? It must have been pushed out of your brain.)

Anyway, this hilarious new sketch, starring and co-written by David Armand, demonstrates the clear effect this memory loss can have on a man when he's training to be a London black cab driver.

Oh, and before we forget, we should also name-check director Adam Jenkins, plus David's co-writer Nick Tanner and co-stars Martha Howe-Douglas and Justin Edwards. Good work, everyone!

Can't remember what you were supposed to be doing next? Ah, don't worry about it. It probably wasn't very important anyway. Have a look at our 10 favourite hilarious viral videos of last week instead...

Loading Slideshow...
  • Ecuadorian Tourist Board Unveils New Advert

    Every fancied a holiday in Ecuador? It's closer than you think!

  • The High-Fiving Cat

    Seriously. <a href=" " target="_hplink">This cat</a> is way too cool for school.

  • Kids Cry At 'Feelgood' Movie

    Because <a href="" target="_hplink">Disney movies</a> don't always have the desired effect.

  • Ferret Hides Remote Control

    Wondering where the TV remote goes? <a href="" target="_hplink">Here's your answer.</a>

  • Rhys Darby Leads His Army From Behind

    It's <a href="" target="_hplink"><em>Flight Of The Conchords</em> meets <em>Gladiator</em>!</a>

  • Don't Look At Me!

    Meet the <a href="" target="_hplink">Greta Garbo</a> of the dog world.

  • The New iPhone 5

    Its secrets are <a href="" target="_hplink">unveiled</a>!

  • Cat Makes Baby Laugh

    <a href="" target="_hplink">A baby. A cat.</a> The internet (and the baby) laugh.

  • The Ultimate Bill Murray Mash-Up

    Ever wanted to overdose on Murray? <a href="" target="_hplink">Well, now you can</a>.

  • How Not To Get On A Horse

    <a href="" target="_hplink">Don't try this at home!</a> Or at the stables.