Stupid shit I do

When I can't figure it out, for too long, it's usually one of these things.

Forget to include a file
Forget to load a library
Forget to call the executed code
Compare with "=" instead of "=="
Misspell variable names
Misspell method names
Forget to migrate
Call the wrong database
Try to use the wrong version of the app (deployed, local, staging)
id instead of a class or class instead of an id
is something overwriting the code that you just wrote?
visual issues: was the resolution increased/decreased?
symbol instead of string
are the file permissions ok?
wrong version of library referenced?
is the configuration specified somewhere else?
Wrong git url (read only vs. read/write)?
scoping issue?
did I put quotes around a boolean literal or variable name?

On making something new that is hard:
Have I written this before?
Has someone else written this?
Does it really need to be recreated?