ShipYourFriendsNothing.com - You can send an empty envelope, or a box filled with just packing peanuts. Fill them with excitement that turns into disappointment, confusion and frustration, as they open the box to find... nothing.

BirdByMail.com - for the people who prefer simplicity, a simple middle finger might be the right choice.

SendYourEnemiesGlitter.com - They also now offer the Glitter Cupcake, which is a farm made horse manure batter, sprinkled with glitter, packed in a heart themed box and surrounded with toilet paper.

SendAnnoyingStuff.com - for those with a softer heart, there's a PG service where you can send glitter, confetti, a poem of hatred, or this image as a postcard.

DicksByMail.com - Sends a bag of edible penis shaped gummy candies with a note saying "Eat a bag of dicks". They also do a candle that starts out smelling like apple pie, but within a few hours changes to fart smell. You can send it with the dicks, with the accompanying message "Sorry about the dicks, please accept this candle as an apology."

ShipYourEnemiesTrypophobia.com - They will ship someone pictures that are special kind of uncomfortable! Carefully selected, human-trialed, photos to leave your enemies trembling in fear no less.

MailBricks.com - Apart from a glorious poetic symmetry, Mailbricks also offer discounts to send bricks to the Westboro Baptist Church and Comcast.

MayoByMail.com - send them mayo in an envelope. Leave them dumbfolded as they try to figure out what happened.

ThePayback.com - From dead roses to dead fish. There's also the box of melted chocolates. Imagine the tears. The devastation.

ShitExpress.com and PoopSenders.com - both of them send shit.