A nuisance is the substantial and unreasonable interference with the use or enjoyment of one’s property. There are endless of examples such as loud noises, offensive odors, smoke, and excessive light (such as a neighbor’s lights shining onto another’s property). Compare to trespass. A trespass is the invasion of one’s right of possession of land. If a neighbor mows his lawn every night at midnight, he may be liable for nuisance, but if he enters his neighbor’s property and mows down his flower garden, he has committed a trespass.