That's because it's in SMP. There's a Spider Jockey under the seatings, but mobs in SMP are extremely glitchy, unless there's only one in a huge, flat, open field. They'll appear to glitch through walls because Notch never bothered to fix this atrocious bug.
Looks like Jeb is trolling.
:L
And hockey-loving skeletons.
Gonna be a pain in the ass.
ikr someone used commands
Hope Notch is not fixing it.
:tongue.gif: