We were upstairs in MH's (then BF) house. His dad never ever came upstairs - except for that one time.
We had shirts on but no pants. MH managed to throw on some pants before his dad came upstairs but mine were under the bed so I just got under the covers like I was taking a nap.
Then FIL decided that he wanted to sit down on the bed and have a friendly chat. LOL. I don't think he knew, and if he did he didn't let on ... late MIL was the strict one (and got REALLY pissed once when she saw us laying on the bed making out) but FIL never cared.
More times than I can count - hence why I had a bad reputation in HS even though I was a nice girl
No cops though
My HS BF once locked his grandma in the basement (a finished basement apartment, but still) and she was yelling why is this door locked. I had no part in that.
Immediately, if anyone from my HS is on this forum, they're going to know who I am form that story. Oh well.
We were caught by my mom when we were taking a shower together. She still teases me about this once in a great while. ACK. She didn't even go in on accident, she just knocked really loud to scare the shit out of us. We were caught by FIL as teenagers, as well. It was terribly embarrassing.