Rita's Water Ice...exceptional...arguably best on the planet...staff is more than one could ask.
So, I was in Philly with a group of volunteers (high school students) and had to take them to Rita's, based on my own past experiences.
When we arrived, the store was not open and wouldn't for about another hour. There was a woman working inside, making ice cream sandwiches and she graciously opened for us. As we were all enjoying our ice, she came out with sandwiches for all of us, which was way beyond what she had already done for us.
I recommend this place to anyone and everyone traveling to Philly (and have since learned there are outlets in Pittsburgh, including PNC park (might make me a Pirates fan!).