I'm feeling very awkward,I just accidently saw my uncles private parts,any advice?

Hello everyone. (Firstly I'm not a troll,so please don't think me a liar). I'm 23 (female) and I live with my uncle (I'd say he's hitting seventy) here in Ireland,anyway,he came back from Bridge (he likes cards) and I was talking away to him when the cat (Xena) jumped up on the living room table beside him. The table is kindof at the same level of the crotch area of a six foot man,so I noticed the cat getting closer to him and then BANG!!My eyes came across a rather embaressing sight-his fly was opened but he wasnt wearing any underwear and ...eeeurgh,the head of his 'you know what' (they're kids on here,I don't want to be too vulgar) was poking out,and obviously straight away I looked back at the tv pretending not to notice. I felt a horrible flush across my face and I was rather shocked and my stomach just turned,felt so sick.. Now,my uncle is a wonderful man,and I know it wasn't his fault,but he obviously figured out I may have spotted his mishap because the next thing I know he was zipping himself up in a corner. I don't want to come across as immature but I'm feeling awkward,and I can barely look him in the eye (I talk away no problem),and I still feel a bit stupidly ill. I know I'l put this behind me,we all have mishaps one way or the other,I'm just wondering if this is a normal reaction,am I being absolutly stupid,I'm a very rational person,why can't I just ignore what happened!?! Thanks for your answers (p.s I know some troll will probably answer this,I wouldn't waste your breath,please don't incinuate any ual answers,I'l probably vomit over the laptop).