When it's a Saturday night and you're on the couch watching anime, watch out. You are approaching otaku-land. Dress in rags, burp, ignore all the social niceties, no problem. Make sure it doesn't become a habit because otherwise you'll act the same way in public. Speaking for myself, this free behavior is something I'd rather not see.
Movies are a date favorite.
Don't forget this. Especially since so much is now out in theatrical release. However, Legend of the Overfiend is NOT a good first-date movie under any circumstances. By the same token, don't drag anime into your social life if it isn't welcome. Honey-bunny will not appreciate watching Wings of Honneamise as an introduction to the Wide Wonderful World of Anime.