I used to carry a dinner knife (butter knife) and a fork in my bags for those too-frequent lonely layover microwave meals. The utensils were "borrowed" from a first-class meal tray.

Inevitably, TSA - "You can't have that knife on the secure side!"

"Uhhh, that's the exact same knife delivered to the passengers in quantity when they eat their inflight meals."

"Doesn't matter. It's a knife. You can't have it. You might attempt to take control of the airplane."