2 things i didn't get
1) When bearded Pete is on the toilet talking about how he would like to cease to exist, another version of him enters the toilet behind him and goes "oh sh1 t" or something like that. then bearded Pete runs after him. Where did the other Pete come from? When did this happen? And how did it not lead to something "bad" when he just ran into another version of himself?
2) Pete desribes at one point in the post-apocalyptic future that he saw the three of them walking in the direction he was running from. When did that happen? And what happened? I didn't get it.