Is one allowed to drink the juices which oozed out during eating; grapefruit issues.
Is there a problem with food NOT stuck on to lettering. Washing off dirt on one's hands.
How much time is needed before or after shabbos to say it is "שכר שבת בהבלעה" (shabbos earnings included with weekday earnings).
Melting ice cubes that were made into pictures, letters, numbers, etc.