What the hell....I googled what a thunderfly was (Sorry, filthy foreign Canadian here, never heard of these beasts), and half the articles that it brought up were about them being stuck in peoples screens.
Yeah it's a tiny (4-5 pixels tops) little black bug that appear during our hot summer months here in the UK. However the monitor was off all weekend and then I turn it on and it's wandering around in there, very strange why it picked the inside of a monitor as it's home when it's hard to get into It looks like a row of dead pixels now