I also got a round of applause once for going to the loo.
I was about 18 or 19 and was at the birthday party of a friend a couple of years older, so although I knew her quite well I hardly knew anyone else there. Went to the loo and there was no loo roll, but I was only going for a quick wee so didn't stress about it.
I’m sitting there and suddenly there's a knock on the door and a male voice shouts 'Don't worry, help's on its way!' A few moments later a hand appears through the open fanlight window immediately behind me (downstairs bathroom, in the summer), clutching a loo roll, and the same voice says 'Here you go.'
'Oh, er, thanks,' I say, and take it.
'Is that enough?' he calls. 'Here's another one.' We both have to raise our voices slightly for this entire interaction.
'Um, ok.' Take second loo roll. 'Thanks, I’m fine now!'
'Well you may as well have the rest', he says, and one by one he passes in two further rolls and - just for good measure - a giant box of tissues. I’m heaping them all up around my feet as there's nowhere else to put them.
'Thanks, that's great. I've got quite enough now. Thanks again.'
Pause. Then, conversationally, he says, 'You know, I don't think I recognise your voice. How do you know Philippa?'
I’m still sitting with my bare arse out on the loo, just inches away from where he's standing with only a thin layer of frosted glass between us. I can't stand up until he goes because he'd see... pinkness, and movement. So I’m just sitting there willing him to go away and he's fucking chatting me up.
'Um, from school, but, um, you probably wouldn't know me. Thanks again for the toilet roll. Really appreciate it!'
Finally he took the hint and after another awkward pause he said 'Oh, ok. Guess I’ll see you when you come out!'
'Ha ha ha, guess so!' I cringed, and then once I was sure he'd actually gone, I finished up my business and came out of the bathroom. The hallway leading to it was absolutely lined with people, who all clapped and cheered as I exited.
I did NOT stay to find out the identity of my mystery benefactor, but made my excuses and went home as fast as I could!