In between the ages of 6 and 12, I used to have recurring nightmares about what I called the "roar-ega monster". The dream could be about anything, but it always ended the same way. Out of nowhere a demonic creature (who's favorite form is Rex from Toy Story, but can look like whatever it wants.) would come up to me, say "ROAR-EGA" and something horrible would happen to me (Grabbed by a giant green hand, having an earache due to a loud noise, some sort of pain going through my body.) Many of those experiences could be considered "Lucid Nightmares". I knew that the dream was about to end, I knew the monster was coming, I knew I was in great danger. Infrequently I found myself able to summon the monster by saying it's name, although why I thought that was a good idea was far beyond me. Sometimes I was able to defeat the monster and wake up almost immediately afterwards, usually by closing it's mouth before it could say anything.
Other nightmares I had were one-offs. In one nightmare I had when I was 6, I was in my bed. I saw my mother on the floor, kneeling. It looked like she was praying. I got off my bed and went into a praying position myself. Suddenly white, disembodied hands grabbed me and placed me back in my bed, while some distorted angelic choir played as music. A similar dream from close to the same age showed me sleeping in my moms beds, with her nowhere to be seen. On a piece of furnature I saw a sign with the word "sale" on it. I half expected a cartoon character from my youth to appear and say "Sale? Hmm." Instead, I get grabbed by a metal claw. It softly but jerkfully shakes me while making this noise "Wa wa wa wa wa wa wa wa. Wa wa wa wa wa wa wa wa....." I woke up in my own bed not long after.
In a nightmare I had at 12 or 13, I was in a room at my house. I noticed a Sonic the Hedgehog doll that I didn't have in real life, and picked it up. A demon came out of it, saying the Sonic was evil, and as punishment for playing his games he would "put a big chunk in my head." He then goes into me, and I wake up. The claw and Sonic dreams both happened at the end.
I had some pretty disturbing nightmares when I was younger, though thankfully they don't come nearly as frequently. The most recent one I has was a jump scare, which gave me a shock. Yes, it happened at the end, surprised?