This actor does an uncanny series of impressions of Robin Williams characters. Yes, even Jakob the Liar.

Did you think this was the real Robin Williams? It's not your fault. It's not your fault.
(via YouTube)

It takes guts to do impressions, because a person can only be absolutely amazing at them, or absolutely terrible at them. There is no in-between. Secondly, it's really bold to do impressions of a beloved actor who was also one of the best mimics of all time. But Jamie Costa had the goods and uploaded dozens of Vines in 2013 and 2014 of himself doing impressions, including a series of uncanny re-creations of Robin Williams' characters, and even Robin Williams doing impressions. When Williams died last summer, Costa stopped doing Williams videos, out of respect and heartbreak.

Sources: Jamie Costa YouTube channel