...people waste your time and take issue with you when you return the courtsey.
...people don't reply to the entire message, either text, e-mail or verbal.
...people owe you money and instead of paying you back they spend money on non-essentials, like a game console.
...the moment you finsh cleaning the kitchen/bathroom someone just has to mess it up.
...you have you repeat yourself more than once.
...things you have coupons for go on sale the day after the coupons have expired.
...people lie to you and you know they're lying.
...you ask someone to do something for you they take forever to do it, but when they want you do something for them they want it done right then and there.