It is amazing how many impressions of classic characters can be done without even using words, and we think these 21 wordless impressions are pretty cool.If you think about it, a lot of classic TV and movie characters have very  distinct trademarks that aren't done with words....from Marty McFly and Doc Brown on Back to the Future, to Arnold Swarzenegger and Kermit the Frog.

So, in 30 seconds here's 21 impressions without words.How many of these can you do?