If one Martin Stein wasnt enough, wed finally get to see the older Stein confront his younger self. While this was pretty cool to see, if was WTF in just what the younger Stein partook in back in the 70s. Forget the frumpy, professional, regal Martin Stein were accustomed to, the Martin Stein of 1975 loved nothing more than lighting up a joint and getting high while he worked. With the 70s Stein more of a Cheech and Chong or Jay and Silent Bob than we were expecting, it was a big surprise to see what the Professor got up to back in the day, and it even seems like hes got quite the fan in Sara Lance, who happily partook in flirting with the younger Stein as well as getting stoned with him. Groovy, man.