Pioneered by Amazon (IIRC) the unobtrusive suggestions like "Other customers who bought Terminator II, have also purchased Eraser" actually make sense. That is until someone gives a whole new meaning to the word "often".

 

"Customers who bought this item often buy"... Locking Key Box (48 hooks) and ... T D INdustrial Compound Laser Miter Saw. Really???

Or this one:  ATN Night Vision spotting Scope

"Customers who bought this item often buy" Cosmopolitan Leather Tote Bag (three colors)

Well, this one actually makes sense. After all you do need something to tote your shiny new night scope around.