Sirens sirens fucking sirens. In Dalston there's barely a minute goes by without hearing them ringing out. I hate them. It always makes me think of something going wrong somewhere, an accident, a burglary, an assault... I suppose you could find it comforting to be reminded that the emergency services are always there if you need them, but it just reminds me that I MIGHT need them all the time.
I think there should be more ice cream vans patrolling the streets to balance the aural karma of the neighbourhood.