What idioms are there that can't be forgotten?

There are many idioms that can't be forgotten, such as:

1, unforgettable: metaphor is remembered in mind and never forgets.

2, no teeth, don't forget: no teeth: life. I will never forget it.

3, never forget: never forget.

4, never forget: miss: always miss. Keep it in mind and never forget it.

5, never forget: never forget after reading. Describe a very strong memory.

6. I have been obsessed for a long time: for a long time: for a long time, for a long time. The description is impressive.