What to call theory where next activity following a fun activity is also perceived as fun? What is the name of the theory that states:


  "if someone is having fun beforehand, the next activity they do will also seem fun regardless of what the activity is."


so like continuing fun... Any similar theories is welcome. I heard about this theory from my lecturer but I can't remember the name of it.
The most related experiment that I can think, is the one that people were willing to drink more water after seeing a happy face, because they evaluated the water as more positive. See full article bellow :

Face Value: Hidden Smiles Influence Consumption And Judgment.