You look like an idiot when you get it wrong, but only to those who know better. If your friends and social group are retards, they will drag you down to their level and make you look like a retard and limit how far you can rise.
It's a fine day for a pelican to flap its wings.
Its = belongs to It
It's = it is, contraction
There is a place where men store their fears, and if you spy on it, you will see they're busy heaping sand upon them.
Their = belongs to them (parallel to Its)
They're = they are, contraction
There = a place, over there
rediculous -> ridiculous
I actually listened to that CD earlier. -> Actually, I listened to that CD earlier.
Simply place the nuclear detonator inside the mainframe computer -> leave out simply, it's stupid
Suddenly I was failing math. -> Suddenly I realized I was failing math.
Make Metalheads Look Good -- Use Good Diction, Grammar, Spelling and Lubricant