I had a couple today - one was boarderline cock-up, but I'm feeling generous.
First one - a flying wedge! Never had cause to penalise one of those before. Someone had the idea that if it wasn't straight from a tap penalty it was okay, so they had a tap, set up a ruck, then did it.
The other was a bit more interesting: there had been a couple of yellow cards, then I'd warned green about creeping offside.
Shortly later (nearly 20 minutes from no side), three of them came up offside all quite close together and I lost patience. I picked out the leftmost player to ping (closest to the centre of the posts) reaching into my pocket as I called him over when "oh ****, I've already yellow-carded him [and hadn't YC'd either of the others]".
I didn't make myself popular.