Community OT: Do-it-yourself

Whether or not this is worth bothering with today is arguable, but maybe a distraction from what are likely [this is being written at 1:00 AM] bottomless pits of inanity in the comment sections is needed. Rather than do an OMD's Pop-culture Corner about one of the things that was kicking around in my head or an old-school five-question OT, let's crowd-source this one.

Ground rules:

• One question per comment so as to keep the answers manageable.
• Your question cannot be about baseball because this is an off-topic open thread.
• Be the best question-asker you can be.