I was at a wedding a few years back, on a table with a group of dudes and partners - the dudes and the groom were all housemates with me at some point for a few years. We had a riot, and it was just the typical work-drink-xbox-sleep cycle while we were young, stupid, and had few commitments.
On the tables were disposable cameras for candid selfies and daft photos - and a few were taken. As the night went on, one of the guys was eyeing it up for longer and longer - until he says "excuse me lads", picks up the camera, and fucks off to the toilet. He comes back grinning, and puts it back on the table. That started a chain of one of us picking it up, going to the bogs, and coming back two minutes later giggling.
Apparently they got developed, and the groom, the bride, and both sets of parents were going through the photos thinking they were super cute and reminiscing, until there was just a string of about fifteen photos of poorly-lit hairy ballsacks, before a return to happy and joyful photos from each table.
The bride and parents were not impressed.