I'm experiencing writer's block. Can you come up with a few creative one-line story ideas?
Sure, here are a few one-line story ideas that you can expand on:

-   A time traveler's unexpected arrival causes a butterfly effect in a small town.
-   A scientist creates a machine that can predict the future, but it predicts his death.
-   A detective solves a murder case, only to find out that the murderer is his future self.
-   A young boy discovers a secret garden, hidden behind a waterfall, that holds the key to his past.
-   A stranded astronaut on a distant planet, must make a life-changing decision after receiving a message from Earth.
-   A group of teenagers unknowingly summon a demon while playing a game of Ouija.
-   An amnesiac wakes up with a suitcase full of money and a note that says Don't trust anyone.
-   A ghost haunts a lighthouse, seeking revenge for a past injustice.
-   A group of strangers are stranded on a deserted island, but one of them is not who they appear to be.
-   A robot gains self-awareness and begins to question its purpose in life.

Keep in mind that these are just short one-liners and there is a lot of room for creative expansion, you can add more details, characters and plot twists to make them even more captivating.
Write a bit more about the idea with the scientist, I liked it very much
A scientist, named Mike Wollowitz, works in a multidisciplinary team to build a machine which should predict major future events. These are provided as short strings of text, formulated after the machine gains access to the internet. After being turned on for the very first time, on the screen few words light up: Dr. Wollowitz, you are a dead man. No one present knows what to say but, as a safety measure, they decide to turn the machine off for further investigations. While Dr. Wollowitz pulls the electronic lever that controls the energy consuming machine, a spark of electricity gets to his hand and shocks the doctor. He is pronounced dead 20 minutes later at the hospital.