We all saw this coming but old habits die hard...
OSX Lion's Resume feature will open up an app with all windows that were open when you quit. So if you quit an app with content that you'd rather not share with anyone and then later open that app in public, it'll open with all those windows as they were before!
I'm a photographer and had been shooting some photos of my girlfriend that let's say are inappropriate for public consumption.
We had been reviewing them in Preview then quit the app. The next morning, I was at Starbucks editing some work. I opened Preview and BAM! Photos of my girlfriend filled the screen 
Good thing I learned that lesson with no clients around, though maybe people in the tables behind me got an eye full.
Share your embarrassing "Resume feature" stories here...
OSX Lion's Resume feature will open up an app with all windows that were open when you quit. So if you quit an app with content that you'd rather not share with anyone and then later open that app in public, it'll open with all those windows as they were before!
I'm a photographer and had been shooting some photos of my girlfriend that let's say are inappropriate for public consumption.
Good thing I learned that lesson with no clients around, though maybe people in the tables behind me got an eye full.
Share your embarrassing "Resume feature" stories here...