An older co-worker was getting dentures, and had all his teeth pulled in preparation. For a week or two he had been on liquids only. We all sat down at the lunch room table to eat every day as a routine. Most of the company was family so they were all mostly related as brother, sister, etc. So said co-worker proudly exclaims that this will be his first time eating solid foods in weeks. It turned out to be two cans of vienna sausage. So about halfway through the meal he opens up the two cans, and then stares at them. Then he calls out to his brother sitting across the table and lifts the two cans up, and says "What do you make of this?" One can of vienna sausages was visibly lighter than the other can. I immediately interrupted with "That's an easy one." Pointing to one of the cans I continued with "That one is lips, and that one is assholes." We were all rolling on the floor laughing except for denture guy. He was so pissed off he just threw out the two cans and walked out. I have never had another moment like that where the joke just came to me in real time. It was a wonderful moment that I will cherish always.