When you're watching a movie that was made before around 2000, doesn't it look funny how no one has a cell phone?
I know we didn't have them, I lived plenty before cell phones came around, but being so used to them now, it just looks funny. And how people would "take calls" ("Hey Joey, you got a call"...)
Similarly........remember that scene from Wall Street where Gordon Gekko is on the beach using his Jurassic cell phone? He's supposed to look cool with it. It looks like he's talking into a shoe.