My grandma often does this, say for example she orders a roast beef baguette and she can't finish it, she wraps the other half and pops in in her handbag. Years ago this would have really embarrassed me, but she did it today and it didn't bother me, was I being unreasonable before to be embarrassed or now to not care I wonder?
Thought I'd pass it over to the mn jury! :-)