Same. I learned Tcl recently for /usr/bin/expect. I wasn't happy to be forced into using yet another esoteric language, but Tcl itself is strangely fun: it's like a more expressive and functional Lua.

Ha, I was in the same position. It's fantastic at scripting serial consoles.

Oddly enough, Lua is also near and dear to my heart. It's a great language to embed to allow non C or C++ folks the ability to extend software or to do so dynamically.