Reminds me of one, my brother and I got a ladder, went up to a mates window, opened it, thre three condoms in, then a condom filled with fairy liquid for realism, and sat back.
Mates mum came back, found them, put the used one in his jacket, which he found when out later for a drink, the other three his mum kept, then asked him a week latter that if he has sex in house, could he please clean up after, causing a big argument there, with mate denying it all.
Even worse, mates mum was told he had left house with another mate laughing and slapping each other on back.
We left it a month befor saying anything, thought it best, as things were pretty tense there I hear