If you're familiar with 'Fleabag' or 'Killing Eve', you'll already be aware of how sharp-minded  and quick-witted Phoebe Waller-Bridge is.

Having written (and in 'Fleabag''s case, also starred in) two of the most acclaimed TV shows of recent years, it's no surprise that the Londoner is adept at thinking on her feet (and being funny with it, too.)

That skill was put to the test during her appearance on The Tonight Show with Jimmy Fallon the other day, when she took part in the 'Think Fast!' segment.

As he threw questions like 'Where do you go when you need to cry?' at her, the answers are predictably silly - but her reply to 'Why is it so hard?' raised a few eyebrows and a few guffaws in the audience.

Watch it below: