The other day Adam came up to me after I had just eaten lunch and told me I had food on my face. I absentmindedly brushed my face with my hand.
A few hours later he looked at me again and said the yellow food was still on my face. I thought back to my lunch of roasted red pepper soup. That certainly wasn't yellow.
I got up and looked in the mirror. Sure enough I had two yellow spots on my cheek above my lip. I wiped at it and smelled it.