I always see ‘em out the corner of my eye
Scared to death to fully see ‘em but I try
I just wanna ask ‘em why they follow me around
And they reply when I hear a sound
Or they walk by and give me a chill I can’t explain

from Crooked I (Ft. Slaughterhouse) – Monsters In My Head Lyrics on Rap Genius

Meaning

People with chronic “I-think-I’m-being-followed-by-demons-itis” are always glancing behind them, afraid of what they might see but they can’t help it. (They say the unknown is scarier than the known).

Paranoia

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