I love to hear of new uses for floss.
Dental floss has many uses.
Cutting a decorated layer cake can sometimes create an unattractive presentation. To avoid the messy globs of frosting that collect on the knife, use dental floss to cut the cake. Just cut the floss to about 8 more inches than the widest part of the cake. Wrap one end around a finger of one hand and the other end around a finger of the other hand. Pull it taut, then pull the floss firmly straight down through the cake to slice it.