Drivers cannot find parking as easily as they would like.
Cars are sitting unused on the street for long periods.
Neighbors fight a new development because it does not provide enough parking.
Parking in garages is more expensive than on street spaces. A new garage is built by the city, but no one parks there because it is too expensive and farther away.
Anger and rage: People fight, yell and scream over parking spaces. For a funny example watch this video
Wasted time: People circle the block cruising for parking-- cruising for parking angers drivers, increases traffic congestion and air pollution, and wastes gasoline and time.