The phartus botanicus, or Yard Fart, occurs outdoors. It is commonly associated with menial tasks such as mowing the lawn, raking leaves, cleaning gutters, spreading fertilizer, etc. It is usually of the phartus phartus variety. This type is closely associated with the phartus botanicus mobilus which is identical in characteristics but falls under the phartus mobilus species.
Also known as the Sleeping Fart, this type occurs during sleep and is usually unnoticed by the producer. It is commonly reported however in dormitories, military barracks, and on camping outings.
The Laughing Fart occurs during periods of hysterical laughter. It is uncontrollable and usually develops in a spiral fart loop, i.e., the laughter produces the fart, which causes more laughter, which produces another fart, which causes more laughter, etc., etc.
This is the common Housewife Fart. It is usually experienced during such activities as ironing, cleaning the oven, vacuuming, washing dishes, making beds, reading the newspaper or using the Johnny mop. It is usually of the phartus phartus variety.