In this step we will go over how to make an easy but realistic howler for about ten bucks.
First off the idea here is that we are using a recordable greeting card to send our voices in a howler. I have found that this is a remarkably simple way to get a very "true to the movie" effect.
(Sorry about not having any pictures I intend to add some later if my camera starts working or I get a new one)
So essentially what you are going to need is a study standard envelope and a recordable greeting card. First, paint the envelope red. Then take apart the greeting card and glue it into the envelope so that when you open the envelope it starts talking. Just glue it in using the same principal used to make it work when the greeting card is opened just makes it so it talks when the envelope is open. Then record a seething message and use a sticker to close the envelope. You now have a real Howler!
Also if this method is too pricy or you want a howler more for looks than function then you may want to just paint an envelope red or instead of a recordable greeting card module just stick some sort of noisemaker in there so it scares or annoys the opener.