There are two great places to get this. Go to www.amazon.com/Loftus-Jump-Out-Spider/dp/B0006GKG0C - Cached and www.ebay.co.uk/sch/i.html?_nkw=jumping+springs
The website www.discoverfun.com has just what you are looking for. They have many plans for all sorts of different pranks including many kinds of spider pranks.
gag
It stands for "Gag Box"
The term gag factor refers to the gag reflexes. For example, a baby has very sensitive gag reflexes so even small amounts of food may cause the baby to gag.
Gag
probably Over The Nose gag..
It is poo
Sharks have no gag reflex.
You die
First a tight cleave gag, two a handkerchief in front of the first gag, three some tape and four an over the mouth gag. Nice and quiet.
There are some dangers when using a ball gag. Ball gags can be pretty rough on the jaw. Two major concerns when purchasing a ball gag are the material of the ball gag and the size of the ball gag.