Son Of A Biscuit

Leonard finds out that his phone doesn't have a signal so they can't connect to internet to pass their time while the girls are shopping. Sheldon suggests that there was a time when smartphones were not invented and people still used to pass their time and takes out his phone to look up for a solution to pass their time but realizes there's no signal. 
This Post Belongs To Best moments from The Big Bang Theory-The Space Probe Disintegration