I was making a Bastille Day cake, and was in the middle of some very intricate work involving black decorator gel and a stylized sketch of the Tour Eiffel, when the fucking tube decided to splat out a big, oily bubble of watery gel in the middle of it. Completely ruined everything, and my attempt to scrape off the gel failed because the icing was a sticky type and held onto it. My cake now looks like a waterlogged bar code.
