We've heard some of the Code of Harry from Dexter, but what about the less romantic codes? ie., Always wear clean underwear when filleting a corpse; look both ways before plunging a hypodermic needle into someone's neck.

Always carry a wetnap.

1. Use cordless power tools just in case there's a power outage.
2. Buy your plastic sheeting at Costco or Sam's Club.

1. Use Dual-Action Spray 'N' Wash on blood stains. It works MUCH better than Shout.
2. Try not to answer your cell phone while "finishing up projects", unless it's a booty-call from your girlfriend.

1: Duct tape is a gift. Then again so is any form of bondage for those unfortunate to make your hit list.

Eat a good breakfast, every day.

If you need to manufacture shock or grief, imagine Doakes wearing a teddy.

Keep your blood slide souvenirs in a discrete place.

Don't overreach yourself by pencilling in an extra murder at the last minute.

Bwahahah. There's a scary fic in that.

Carry around a switchblade to slash the tires of suspicious co-workers.
NA meetings are great places to vent about your "addiction."

Never trust a Carradine.

"If you turn out to be one of those serial killers that must cross-dress to do the deed, don't wear red lipstick. It looks whorish."

"Avoid stealing lawn ornaments."

Use the sturdiest of garbage bags for disposing body parts.

Hide your GPS from meddling bitches.

Leave your captives plenty of food, water, and don't forget a bucket to shit in.

Bring donuts to work.

When in doubt, headbutt.

Select a cheerful-looking blonde girlfriend. Even if the complicated brunette is hotter. Just trust me on this.

I like this one.

Ugh, I'm too late for this thread, too... but here's one.
Always listen to your sister's bitching, even when you want to cut her throat.

Dont kill the Police Officer who is convinced your a serial killer.

If there's a hot woman looking at you, dont kill her, she probably just thinks your hot.