@dvorakdan: Most of the sources I've seen say to use a capital letter after a colon if it's part of a complete sentence, while other sources say this isn't necessary: it's a style choice.

What I'm wondering is this: do the colons in this quote represent proper usage? A colon should be preceded by a complete sentence, but these "if" statements are only one-half of a conditional sentence, right? Shouldn't a comma (and an optional "then") be used instead?

"If it is unappetizing, then do not eat it, date it, or sign up for it."
(I added more instances of "it" in order to be more consistent with the next sentence.)

Fixed a lot of basic punctuation errors, not sure where the submitter got this from, but don't start a phrase with a capital letter after a colon. I assumed it was a DIY quote because it was also marked unknown, but google found the actual author for me.