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For instance, if you hate it when your housemates leave their dirty dishes for you to wash, you might want build up some fiery anger in your heart by going to the kitchen and looking at the overflowing sink or even just thinking hard about them leaving their plates there without washing them.

It's easier to recreate expressions of displeasure if you have. Putting genuine emotion behind your frown almost always makes it much more convincing, so fuel your negative emotions by exposing yourself to something that you hate. You can also try simply thinking about this thing if you'd like to avoid actually having to deal with it. Try thinking about your S.O. leaving you for someone else, your term paper getting accidentally deleted, or another similar disaster - whatever makes you angry or sad.