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Zach, if an element repeats more that once, itll double up in the output
array. need to add a .uniq on the end

irb(main):165:0> a = [1,2,3,4,5,3,5,3,5]
=> [1, 2, 3, 4, 5, 3, 5, 3, 5]
irb(main):166:0> t=[]; a.delete_if{ |e| r=(not t.include? e); t.push(e); r }
=> [3, 5, 3, 5]

That aside, this one is a little shorter, and seems to benchmark a touch
faster as well.

irb(main):180:0> a=[1,2,3,4,5,3,5,3,5]
=> [1, 2, 3, 4, 5, 3, 5, 3, 5]
irb(main):181:0> t=[]; a.select{ |e| r=t.include?e; t<<e; r }.uniq
=> [3, 5]
irb(main):182:0> a
=> [1, 2, 3, 4, 5, 3, 5, 3, 5]

Mark

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