It might read something like a teen movie, but not a word of this is a lie.
We had an assignment to do at uni which involved a bit of software that was on the uni PCs. A few of us had a dodgy copy but the CD went MIA and crunch time was upon us. Three mates had one day to do it and wanted to work together but didn't have a copy of the software and didn't like the idea of an allnighter at uni. They asked to borrow another mate's laptop, Robbo, for the night.
They got the job done and decided to take the liberty of installing a porn screensaver because this Robbo bloke was pretty straight. They returned it the next day, and were very appreciative.
What they didn't know is that this was Robbo's old man's laptop, and his old man was a priest.
Sunday approaches and the old man hooks the laptop up to the projector at the church, preparing the PowerPoint presentation for the sermon. Half way through a speech a fornicating couple flash up on the screen behind the priest to the surprise of all the kids, old ladies and nuns alike. He didn't know what to do, nor what was going on. The place went a bit hysterical.
Robbo was banned from the laptop and had to buy his own after that. Never really forgave the other blokes either, must have lots a lot of points with the old man.