Whit? Whit?

You know that old TV series Catchphrase? I watched it a couple of times but gave up on it pretty quickly. The presenter would say 'just say what you see' but I'll admit here and now I could never see a damned thing.

A pal sent me a picture on Facebook today. It obviously means something to him and he thinks it should mean something to me but I admit I haven't a clue what it's about or why he would send it to me:

I don't get visual jokes. And yet I love slapstick - Buster Keaton is my all-time favourite film character:
http://www.youtube.com/watch?v=zsyRhRR5Iu4

I also love this bit in Philadelphia Story with Katharine Hepburn and Cary Grant:
http://www.youtube.com/watch?v=ukZDbYWVybs

Words are my thing, without a doubt. American humour - fast, very witty - is ace. If you haven't seen them, you should watch Frasier or Golden Girls or News Radio http://www.imdb.com/title/tt0112095

- or Michael J Fox in City Hall - my hero. Then let me know what you think.

Meanwhile, can anybody explain the picture above to me?