skyscraper101
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There are quite a few places doing Segway tours I think. I went on one in Budapest. Despite making you look like a tit they are actually pretty efficient for pottering around a city, and everyone learning how to use one is a good group bonding activity. You can also roll a fag on one once you've got the hang of it.

They were using them in Berlin too for city tours when I was there last week. If I'm ever back there I might just do one for a laugh.