To Tip or Not to Tip?

I have missed my episodes on Aloha Friday, but good thing I am back.
And this week's question is:

When you go to places like Starbucks or Jamba Juice, do you leave money in the tip jar?

~Well, if I paid cash, I do leave some tip on a jar. But it always depend on how the employee do her or his job and how he treats his customers. But sometimes, I just don't tip at all, if I paid using a card, neither do I add tip on the receipt.