About three years ago I was leaving MSP when I was 'randomly' selected, I remember after every item in my messenger bag was spread out on the table, the TSO picked up my travel journal (the kind found at Border & Barnes & Noble, a 4.5" x6" notebook) thumbed through it and started reading it.
For a good 5 minutes.
Not just skimming the pages- READING word for word, page after page.

That still irks me to this day.

For the record, my travel journal does not have sketches of municipal plans, schematics or any red flag words such as WMD, Bomb, Gun, Allah, etc.

I note the date, city and good restaurants, eateries, hotels, shops, and museums I liked and/or would like to check out as well as notes on the weather, architecture, and cool or weird historical factoids and references to my digital camera for any photos I may have taken.