Sorry, should have come back to this thread earlier! Have been swithering about posting as these will out me, but here goes:
Example 1 - I was about 12, staying with my brother and cousins at my grandmother's house for a week, an annual event to give our parents a rest! I had a dream on our last night that I was running along the beach with our dog, a beach we often visited, and in the dream our dog was young, fit, healthy, full of vitality and I was thinking as I was running how lovely it was to be running with him again, how well he looked (in RL he was 13yrs old). When we got to the end of the beach he turned to me and said "you can't come any further with me, I have to go on my own now". Part of me was stunned about the dog talking to me (even in the dream!!) but I knew he had to go, so I watched him run up the sand dunes and over the machair, then he was out of sight.
The next day my parents collected us and took us home. When we walked into the house I heard the dog bark from the kitchen, which he did every time we walked in, I shouted his name and went to run to the kitchen, but my dad grabbed me and took me and my brother into the living room. Then sat us down and explained that the dog had been put down the day before. My brother was a sobbing mess, but I was very quiet and still - I had just heard the dog bark, as clear as a bell, and then my dream came rushing back to me. He was saying goodbye. I loved that dog - he'd been in my life, for my whole life. He was saying goodbye 
Example 2 - Only 3 years ago. It was a bright sunny day and I was in the garden hanging up washing when my mum phoned for a cheery chat. She blathered on for a bit, then said "oh, your granddad has gone on holiday again". As mum was talking about him, I heard a voice saying "to die" and "Loch Assynt" (I had never heard of Loch Assynt before this day). As I heard this voice, I felt like the sky had clouded over and I got very cold. Mum said that granddad had gone back up to Sutherland (Scottish Highlands), where had only just been, a week previously. She couldn't understand why he was going back up, it was such a long journey from where he lived (Isle of Bute) and he was 85 years old. I wanted to tell her that he was going there to die, but I would sound like an absolute loon! All week I was uncomfortable, I felt his presence 3 times, and at the end of the week when he hadn't phoned in, Mum had to contact the hotel he was booked in at who confirmed he hadn't returned and a huge search and rescue operation was launched, including specialist police divers and sniffer dogs. He was was never found. His body is thought to be in Loch Assynt, but it has never surfaced. I knew what was going to happen. His death is recorded as accidental or misadventure, I can't remember which, but I know it was planned. Whatever his reasons were, we will never know. I have told my Mum my story, and my aunt wanted me to repeat it to her, I don't think it gave them any comfort, it's a sad story, but they wanted to hear it.
Those are my most extreme examples. Mostly what happens is I think of something, then I notice it again maybe 2 or 3 times, then it happens. It can be anything from thinking of a long lost friend who then pops up somehow, or buying a lottery/raffle ticket and feeling absolutely sure I have a winner, and then winning. I've known about friends being pregnant before I have been told, I've known about people dying before being told (although not as extreme as the above examples!). I often pick up my phone to dial out and find I am already connected to the person I want to phone. I am quite intuitive, good at reading people, and I do use my gut instincts a lot.
But if you met me in RL you wouldn't guess - I'm such a cynic! I really don't go in for the "woo" side of things AT ALL, but these things keep happening to me 