Step 1: Draw the body
Start off with an oval shape with a bit of a flattish bottom (to stop it falling over)
Step 2: Draw the skin
Add texture to the body by crossing diagonal lines across it
Step 3: Draw a neck
Draw a short curved line slightly above the body following the shape of the top. The neck is very important - otherwise your pineapple will be unable to swallow things.
Step 4: Draw some spikes
From the neck draw a slightly curved zig-zag to give it some awesome pinapple spikes
Step 5: Add some more spikes
Layer up your spikes by drawing more just behind the first set
...then some more behind those...
...and more behind those
Step 6: Just keep adding spikes forever
Just keep drawing spikes until either the pinapple looks like it's probably finished or your arm goes numb. We recommend the first of those.