I live in a one bedroom apartment but one of my brothers is living here until he leaves for basic training in a few weeks. So his bed and desk and computer are all out in the living room.
He recently got a new girlfriend and I'm almost positive they're doing stuff in my living room that I'd rather them not be doing. But I can't just accuse him without proof though, so whenever I'm gone for a long time and come back, I try to unlock the door and get inside as fast as possible. Like before I even get into the building I'll get my keys out and hold onto the one key that I need, and when I get to my door I line it up as best as I can to unlock it quickly. One of these days I'll catch them doing something, I know it.
Well anyway, two nights ago I was over at my girlfriend's place until after 3 in the morning, and I was gone for hours. When I came back home I entered as I described above, very quickly. I guess his gf wasn't here at the time. Instead, he was alone, at his computer. Since I entered so quickly, all he had time to do was scroll his mouse over and close the internet explorer window he had open. I didn't get to see what he was watching, but I did get a pretty good view of his bare ass as he sat in his chair, with his pants around his ankles. But I decided to play it cool and not let him know. All I did was say "Hey" and walk to my room as fast as possible. I never did mention seeing anything. I'm pretty sure he thinks he got away with it and that I simply didn't notice.
So last night he was out in the living room playing Halo. Whenever he's playing his silly games, he gets completely involved in them. He won't respond to anything anyone says to him. I decided to fuck with him. I walked up behind him and say, in a serious tone, "So... last night, after I came home, I saw something really interesting..." He froze. He stopped playing completely. I even think his little blue dude got killed in the game, and he didn't seem concerned. And so I continue talking... "I saw some really interesting Halo 3 vids online. Want to come watch?" I heard him sigh with relief and continue playing. He said, in a shaky voice, "....Oooh, yeah, alright, I'll come see them in a bit."
And then just a few minutes ago, he was out there with his girlfriend and I walk out there and say to him, "So.... two nights ago... after I came back from Jen's place... I couldn't help but notice how obvious it was... that you had erected... a very large... pile of dirty clothes near your bed. You should pick them up." Again, at first he looked like he was in deep shit and had been caught, and then he sighed once it was clear I wasn't talking about his wiener.
I think I'm going to continue fucking with him until he breaks down and has to admit it. This is going to be really fucking fun.