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 sir, cache invalidation is hard 
 One of the two hard problems in Computer Science. 
 What's the other one? o.O? 
 Naming variables, and other stuff 
 The two hard problems in Computer Science:
2. Cache Invalidation
1. Naming things
0. Off-by-1 errors 
 Theres a joke in here that I might understand one day. 
 It’s my favorite nerd-joke of all time. 
 The fact that you know more than one nerd joke, to the point of establishing a hierarchy, is very revealing XD.