I almost always keep open iTunes and Windows Explorer (probably in my music/pictures folder) open just in caseI thought you were me for a second...
That works.
Or just have a game up and then switch it over to that when they walk in.
Of course I can look at research with my father around, he doesn't care lol. He knows about my naked woman stash. And so does my sister :p
I can't exactly remember his reaction, but during the car ride home, I had to explain to him that there's a whole internet fandom. He seemed to understand, although he did laugh most of the time.
Hm that went better than expected, my dad would probably be like "YOU loving friend! GET THE forget OUT OF THIS HOUSE RIGHT NOW!"
/strict parent..