These quaint traditions are among those consigned to history by the disappearance of adjournments. Once upon a time we used to seal a move after reaching the first time control and then continue the game after dinner or on a separate adjournment day. And this led to all sorts of interesting factors, such as who you could get to help you analyze and how one might cope with too many helpers. There’s a wonderful chapter on adjournment analysis in The Art of the Middle Game by Paul Keres and Alexander Kotov.
Here’s a clip featuring these tactics from games 19 and 20 of the 1985 World Championship match between Garry Kasparov and Anatoly Karpov: