We almost choked on our sandwiches, with this one.
na pół = in half (prounounced "nah poo")
na = on, in, for etc.
We were eating grilled tuna and cheese on this funky, monster huge bread. David was struggling with his and told me, "I need my sandwich to be on pół."
I believe I'll keep this one in my files for whenever I'm feeling sad or depressed. I laugh every single time I think about it.