I like In N Out better. But Five Guys is still pretty good and their soda machines are so cool!
I've had real Belgian waffles! There's this random Belgium guy in the Sacramento are who has a waffle food truck thing and is always at my schools events. I had one with ice cream and it was delicious!
Also, in NorCal/Orgeon/Washington there's a coffee chain called Dutch Bros and it's amazing. I always get an iced White Zombie off their secret menu. I'm not sure what it is, but it's delicious, and overall the chain is just awesome. The people that work their are really nice too!
Annnnnd, in September I'm going to be in London for a few days before going to Paris, so if you London folk have recommendations for anything near Kings Cross Station (we're staying near there), that'd be great!