An abusive note was plastered onto a paramedic's ambulance as he battled to save a young girl's life inside the vehicle.
Chris James Nixon was told his behaviour was 'appalling' by a resident who claimed he couldn't get into his house.
The letter warned that pictures had been taken of his parking at the emergency on Friday.
Mr Nixon, who lives in Tynemouth, Tyne and Wear, and works for the North East Ambulance Service, posted the handwritten note online.
He wrote: 'Whilst working hard to save a young girl's life in the back of the ambulance, received this from a fan who left it on our windscreen!'
The letter, corrected for spelling and grammar, reads: 'I have taken pictures of you leaving your ambulance in the middle of the road, when there is no need for. See pic.
'Your behaviour is appalling and you should be kept responsible for your actions as "professional driver". (signed) Resident who can't get to his house!'
Kriss Elkaypea was among those to react with disgust, writing: 'Pity they didn't leave their address so you could accidentally (of course) crash the unoccupied ambulance thru his front wall later.'
Kristie Graham said: 'Wow! I can't believe these people actually exist! What an absolute d***!'
Daniel Jones commented: 'So when they call for an ambulance, make sure you park legally, maybe pay and display. All the while they're bleeding to death.'
Dan Douglas wrote: 'Please tell me where they live.' Jimmy Craik said: 'Should have reversed straight over the c***.'
Sarah Coyne fumed: 'So if their relative was gravely ill, they'd expect you to drive around the block to look for a parking space, potentially park a distance away from the patient, and delay their emergency, life-saving treatment? Should have left their name so we can do just that if the need ever arises.'
Some people hit out at the grammar and spelling mistakes made in the note. Chris Holmes wrote: 'The author could have made good use of their waiting time to research how to use the English language. Cretin...on several levels.'
Craig Hall said: 'I hope you corrected their spelling. First and foremost.' Victoria Williamson commented: 'That's absolutely disgusting! That's after about 10 attempts to understand any of what he said!'
Chris's only response to the comments was to spell out the urgency and difficulty of the job.
He wrote: 'Was a bad trauma job as well. HART (Hazardous Area Response Team) was in the back with me.'
Last December, a paramedic in the North West Ambulance Service shared a picture of a letter left on their ambulance in similar circumstances.
The expletive-ridden note branded the paramedics 'a***holes' and 'd***heads' for being blocked in to their driveway in Manchester.