Things that make you go hmm -- or is it hhmmmm?
Some people play sports. Some cook eight-course meals. And some make wickedly complicated charts about words. Have you ever wondered how many different ways people on the Internet spell "hmm"? Programmer and language geek Oliver Steele answers all your hmm-related questions with "The Hmm Page", a graphical representation of spellings ranging from HMM to HHHHHHHHHHHHHHHHHHHHHHHHHMMMMMMMMMMMMMMMMMMMMMMMMM. There's even an interactive feature that allows you to click on a spelling to Google its appearances.
Steele has other language toys on his blog, including an animated ambigram, a word that looks the same when viewed from different angles.
Does this post make you go "Aargh"? Don't worry — there's a page for that too.