I would like to point out the Ed Hardy bulldog pants.
The spider scene is marking the center of the Thriller sequence.
It is like an key angle point.
The spider robot get's on stage after having been announced in the back screen.
Michael is getting out and - does wear a very unusual outfit - at least compared to the other outfits he choose in TII. It is casual wear for spending a relaxed time, lose, easy going.
The Ed Hardy pants are showing two bulldogs.
What is the character and the symbol meaning of bulldogs? Some descriptions:
QuoteBulldog Temperament
The Bulldog is a gentle, easy going, and affectionate dog, with a wonderful nature, a comical outlook on life, and a really entertaining personality. The national symbol of Great Britain, the Bulldog is known to be extremely amiable, friendly, and loving, and loves to spend time with his family. Known to be one of the most dependable breeds around, the Bulldog makes a wonderful family pet, and is fine for the more inexperienced dog owners as well as those with experience. The Bulldog can have a stubborn streak, but is also a very docile breed with plenty of affection and devotion to give to his family.
The Bulldog is known to be excellent with children and will get along with other pets too, but be way of his jealous streak of another animal tries to take his food! His sweet nature and comical attitude makes him a big hit as a family dog. This is a breed that has inbuilt laziness, however, so don't expect your Bulldog to go romping around and playing Frisbee with you. It is important to exercise him for health reasons, but this should be along the lines of gentle strolls and walks in cooler weather. With strangers the Bulldog may be reserved, although some will be quite friendly. He is a sensitive and intelligent dog,and is ideal as a pet in a relaxed household.
http://www.justdogbreeds.com/bulldog.html
(I think this is a very charming description of a character.)
QuoteUSMC [U.S. Marine Corps] Bulldog Tattoo - The tradition of using an English bulldog as a mascot for the United States Marine Corps has its roots in the early part of the last century, in the fighting campaigns of World War I. In an interesting bit of turnaround, it is not an image which comes from within Marine Corps ranks but instead comes from the hard won respect of their foes. German soldiers referred to the Marines as teufel hunden or "devil dogs" undoubtedly owing to their hellacious fighting ability.

This ebay offer shows the pants from all sides:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270621820578
This gives the scene in TII:
[youtube:n191vs6l]http://www.youtube.com/watch?v=icHAOUAPzqc[/youtube:n191vs6l]
http://www.youtube.com/watch?v=icHAOUAPzqc
;)