Lesser-known trolley problem variations

Putting a stake in the popular philosophy thought exercise.

The Time Traveler
 
There’s an out of control trolley speeding towards a worker. You have the ability to pull a lever and change the trolley’s path so it hits a different worker. The different worker is actually the first worker ten minutes from now.
 
The Cancer Caper
 
There’s an out of control trolley speeding towards four workers. Three of them are cannibalistic serial killers. One of them is a brilliant cancer researcher. You have the ability to pull a lever and change the trolley’s path so it hits just one person. She is a brilliant cannibalistic serial killing cancer researcher who only kills lesser cancer researchers. 14% of these researchers are Nazi-sympathizers, and 25% don’t use turning signals when they drive. Speaking of which, in this world, Hitler is still alive, but he’s dying of cancer.
 
The Suicide Note
 
There’s an out of control trolley speeding towards a worker. You have the ability to pull a lever and change the trolley’s path so it hits a different worker. The first worker has an intended suicide note in his back pocket but it’s in the handwriting of the second worker. The second worker wears a T-shirt that says PLEASE HITME WITH A TROLLEY, but the shirt is borrowed from the first worker.
 

And so on. I'm not really sure what I can learn from the trolley problem, but I'm uncomfortable that the most common version always involves an fat guy. In fact, it's just referred to as The fat man problem!