I don't know about you guys, but just seeing this picture makes me want to visit Singapore's Changi Airport where fliers can take the easy way to the bottom of the terminal with these delightful slides. If you're a slide enthusiast or just curious what other weird places could install slides, don't miss this great Oddee article.
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(i) it's outside the actual transit terminal - you've got to do passport an customs to get to it; and
(ii) they have a size limit that excludes most adults. Still, there's a very good food hall there. Singaporean youths come out and chill at the airport.