Shells

What shell does /prog/ use?
I've only used bash, but I want to explore my options. So, which shell do you use, and, if you feel so inclined, why?

When I use a shell, I don't want eight extra KILOBYTES of worthless regular expressions and TCP/UDP support! I just want a TCSHell!!
Not a "bash". Not a "zsh". Those aren't even WORDS!!!! TCSH! TCSH! TCSH IS THE STANDARD!!!