This one is near one of my favourite spots which holds a lot of memories. The hiding spot is somewhat risky because there can be Muggle traffic, but I think if everyone is careful it should be okay. This place reminds me to follow your heart, to enjoy the moment, and that happy hour is awesome. Also, "I may not be perfect, but let's be honest - neither are you."
I covered a small, small tuperware (courtesy of 100 yen shop in Okinawa, Japan) in Lamby duck tap and included a bunch of trinkets that remind me of my bestie. No need to BYOP. Please be stealthy!