Triskaidekaphilia
I declare myself a triskaidekaphiliac. The word amuses me so much that I just had to blog about it.
All it means is that I like the number "13". It's considered an unlucky number, and I'm not superstitious, so I picked it as my favourite number just to raise eyebrows. Some people take the bad luck associated with the number "13" seriously; they even made up a word for it, triskaidekaphobia. Take phobia - fear - and replace it with philia, and you get my new favourite word (my previous favourite word was defenestration).
Words are fun! :)
[Update - another funny little word, from Mihaela: hippopotomonstrosesquipedaliophobia (fear of long words)]

Reader Comments
I like defenestration more :D But with the new one you can make pronunciation contests, or even better, spelling contests :)