What non-major episode always makes you cry? What episode genuinely scares you?

Are there any non-major episodes (not two-parters, major fights, introduction to companions) that make you cry every time you watch? Either from sadness or happiness. Are there any episodes that genuinely scared you?

I cry every time I rewatch Vincent and the Doctor. When the doctor show Vincent Van Gogh how loved his art is in the future. Then when Amy realized that he still ended his life after they left.

I watched "The Empty Child" for the first time as a kid and it actually gave me nightmares. It still gives me chills as an adult now and as a parent.