What kind of work have you volunteered for and what do you think of volunteer work?
Someone once told me that it is like an interview, 'they' see how you perform when you're at 'work'; like how you handle the situations when it goes wrong, how you carry out tasks given to you, etc.
I've volunteered as a librarian for human library, it was extremely fun and challenging. I was in-charged of the registration and also had to keep check of the time! Also, I managed to speak to one of the 'books' during his break and it was inspiring.