A pastebin with almost no user interface
I’ve always favoured pastebins that let you bin a paste and nothing more – p.defau.lt and sprunge.us spring to mind. I’ve made a Perl almost-clone of sprunge.us:
https://p.hashbang.ca now runs WWW::Hashbang::Pastebin, a simple pastebin written with Dancer and DBIx::Class that does nothing but store your text and show it back to you. The only feature beyond that is if you append a +, you’ll get line numbering (no syntax highlighting). You can use an anchor to jump to any line (click the line number), and the number for that line will be highlighted.