User blog comment:Numbuhthreefan/Cap This (unofficial captioning activity)/@comment-25474566-20160418145215/@comment-11883116-20160419151516

Yes, but in only two cases:
 * It's not that long after you uploaded the joke (you noticed there was some typo or something).
 * You'll ask N3 for permission. She'll remove the first joke, and you'll add the correct version as the next one. That is IF she agrees.