You shouldn't take up spaces meant for disabled people.
Chuck is running late for work and is having trouble finding a parking spot.
Chuck wants to get into the office.
Chuck sees a handicapped space but decides against it, then notices someone pulling out, so he quickly pulls into the space.
Chuck sees a handicapped space and takes it, so he can get to his job.
Chuck makes it inside on time and feels like he did the right thing by not taking the handicapped space.
Chuck makes it inside on time, but when he comes out, there's  a parking ticket on his windshield.