spontaneous retaliation 

when you get back at someone for petty annoyances.

huhh, wtf how did my coat go from being on your bed, to that dusty, dirty, hairy spot over in that corner. It's time to get revenge for your arrogance

spontaneous retaliation by 65654 December 8, 2004

spontaneous retardation 

An uncontrollable reaction to a particular event or stimulus where there is a total loss of most brain action.

1. As Bob and Joe were walking by the park, they had a sudden urge to play on the jungle gym due to spontaneous retardation.

spontaneous retardation by Better than Bacon? Impossible. January 10, 2010