Oh I know I'm being unreasonable really but every time I hear the deafening sound of RAF fighter jets flying overhead...like they were 10 minutes ago (which they only seem to do at night??) it scares the beejayzus out of me 
I live less than 10 mins on a train from the Olympic Stadium and worry that if they have to shoot anything out of the sky...they're going to do it over my house?!? 
I admit to laughing when I read they're going to store surface-to-air missiles on the roof of a block of council flats near the stadium...but it's not funny really!
Well ok it was a bit funny cos I know the block of flats they mean and all I can say is they're going to need to bolt them down, or they'll find they've been nicked and replaced with a block of bricks 
Anyway, the thought of a terrorist attack (God forbid) is a very worrying one...whether it's in the sky or on the buses/trains.
And hearing the jets flying overhead just makes it seem all the more real in a way.
Like I said...I'm a wuss 