My favourite high strangeness case is the one about Jean Hingley and the Christmas aliens.
Here's a version of it from
http://www.thelosthaven.co.uk
Location. Rowley Regis West Midlands England
Date: January 4 1979 Time: 0700A
Jean Hingley had waved goodbye to her husband while he went off to work in a bitter cold morning when she saw a light in the garden. Thinking he had left the carport lit, she went to investigate, but it was dark, so she returned to the kitchen. She put down some food for Hobo, the family Alsatian and called him from the garden, but he flopped down as if drugged and gazed at the ceiling, glassy-eyed.
Then, with a "zee---zee-zee" noise, three weird creatures flew past into the lounge. They were only 3-1/2 feet tall and had waxy white faces and coal-black eyes with no eyebrows and very thin mouths. They wore silvery clothes, with a transparent bubble-type helmet over their heads. These humanoids also had transparent "wings" and floated. Jean was clinging to the sink paralyzed but then, she says, she suddenly floated towards the lounge.
Jean noticed that the aliens were inspecting the ornaments on the Christmas tree with interest. They also probed into her mind with telepathy---"It was like a light or an X-ray penetrating." They told her she would not be harmed and, when she asked where they were from, they said (or rather she could not tell which one said), "We come from the sky." The she explained why the house was all dressed up to celebrate Jesus birthday. "We know all about Jesus," they claimed.
They said they would return and, "We come down here to talk to people but they don't seem to be interested." Finally when she showed them how to light a cigarette they fled as if in terror, taking a mince pie each with them. Outside, on her garden, was an egg shaped object with windows. They floated into it, and it took off, emitting a bluish flash and pulsating twice before disappearing with a flash. The dog returned to normal, and Jean called the police.
The electric clock in the house had stopped, and all her cassette tapes were magnetized and unplayable. In the snow where the object had sat, was an oval outline, which the local UFO group was able to photograph before the snow melted.
HC addition # 440
Source: Alfred Budden, Fortean Times # 50, Jenny Randles "Abduction" Type: B
I'm sure I read another version where her Christmas tree disappeared a few days after, though. And she also had problems with her eyes for a while later.