I have a few examples but wasn't going to respond until I read Larrytheleprechaun's reply and felt I had to as we seem to lead parallel lives:
"Bad car accident where my friend died and I later spent 5 months in hospital. Actually it was not scary at the time as I was only 17 but now it scares me shitless at how ill I was.
Son with croup, getting bad very quickly and the following panic when I brought him to the Doctor on Call.
Being told unexpectedly our 64 year old father had only a short time to live and knowing we had to look him in the eye and try to carry on as close to normal as we could. That was Sunday and he was gone Friday night. I wanted to stop being an adult that week :( "
Ok, here are mine:
Bad car accident on motorway in France. Aquaplaned at 70 miles/hour. I was in the passenger seat of a UK car and knew we were dying as DH lost control and we hurtled towards the central reservation, then up the bank where we flipped over several times. I was cut out of the car by emergency services and then spent 8 hours on a high dependency stretcher; we all spent 3 nights in hospital. After various scares snd a highly interesting trip back home we were all ok in the end, incredibly. I still have nightmares 14 years later though.
DS2 suddenly developed croup age 2. We've had an emergency ambulance ride (from our local walk-in centre - I was rather terrified when our triage nurse ran out in the corridor requesting 999 assistance!) and a very thrilling helicopter ride from a Swedish island to the main children's hospital in Stockholm. Was a lot less fun trying to get back to the island the next morning!
Finally and most importantly: my Dad died suddenly, age 65. He and my Mum had retired back to Sweden; she was visiting my sister in France. Police couldn't get hold of her so eventually called me. I'd just put children to bed and was waiting for DH to come home when I got the worst call of my life. I then had to phone mother, sister, brother, aunts... with the news. Still have nightmsres. Was extremely close to Dad.
Oh and my DH is Irish (as are our boys, half anyway). Would love to hear from you if you want to PM?