10) I built a wiki engine. A hidden one. I've forgotten a bunch of the codes. It is a major part of my marketing in my new career. www.moonwaves.com - but you have to visit a special page and enter a username and password to activate the wiki features. Otherwise it looks like a non-wiki site.

13) I used to but my wife owns a costume shop and she swiped them. She rents them out.

17) My usual "hello, world" for a new language is a simplified Zork engine. I've implemented it in the macro language of graphics programs in order to convince myself I knew the language well enough to document it.