Leaderboard

I remember, back in the day, there was a twig leaders' syllabus that outlined acceptable behavior at large events, such as limb meetings, branch meetings and so forth. One of the admonitions listed was to "refrain from picking your own seat." My question is this: Are there currently any circumstances under which it's acceptable to pick your seat? Whose seat should you pick instead? (Yes, thank you, I've been told I'm a twisted individual.)