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Well, according to me I would say Ashtray's and heartbreaks..
Pushing away and hurting the one I loved the most.
Well, it's a very rhetorical question...its same like why do we park on 'driveways'? But I may have my opinion of it.. because they never seem to finish (look around your house, sometimes there are always bits that are unfinished ) so a building is never really completed!