Creative excuses for fasting?

Currently 66 hours in and am in the office today and a colleague from France baked a special “Kings Cake” that is normally eaten in the 6th of January. She was very excited for me to try it in particular because we are both foodies, but she invited the whole office to join. There’s a hidden bean inside and whoever gets it is crowned “King”, so there was a risk it was in the piece she gave to me.

Fortunately someone else found it but people asked me why I wrapped it up in foil instead of eating it. I said I had to fast today for a blood test this afternoon but that I would enjoy the cake later.

Any other creative excuses fellow fasters use in such situations so you don’t have to explain the whole process, science, electrolytes, and that no, I’m not going to die with all this excess fat on my body to be burned up?