Sometimes reality checks are too big to be cashed
Mailed one when I heard Unique had died in that crash
Seems like yesterday I just seen her smile and laugh

from Big Sean (Ft. John Legend) – Memories (Part II) Lyrics on Rap Genius

Hes using a comparison of real checks and reality checks. he is saying that sometimes things occur real life that are so significant that it’s hard to understand why they happened.

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