What are some fun things to do when you're with a friend and grounded?

My best friend is in town visiting and staying with me for a week. But today, I got grounded and so we're not allowed to go anywhere or have people over. My friend has her phone but my Mom took mine. Soooo.... Any ideas on some fun things to do? We do NOT wanna read or write haha it's just not our thing. We're sixteen if that helps at all.