Thank you to my friend, Jackson, who taught me how to do this. ALERT : This is extremely funny.
Step 1: What You Need
~ Spider eggs or a few spiders
~ A bucket of lava
~ (optional) a Sword
~ some sort of block to cage in your pit
Let's get started!!!!!
Step 2: Digging the Pit
First, find a nice flat place to start digging your pit and get rid of the stuff that might get in your way ( trees,grass,etc.).
Then, start digging a 6x6 hole that is 3 blocks deep.
Step 3: Filling the Pit With Lava and Adding the Platform
Now, going from the bottom up, fill the pit with lava. But stop at the second row of blocks, and start adding your platforms by putting your chosen block twice and then adding your last row of lava.
Step 4: Adding the Cage and the Spiders
Now take your same chosen block and build around the pit until it's three blocks high. Then
add your spiders on the platforms and watch the fun!!!! (You may have to punch your spiders once to make them move).