Social contact is known to be vital for older adults' mental and physical health, but few studies of social interactions have taken place in long-term care settings. The current study investigated whether the psychological well-being of assisted living residents was influenced by factors associated with residents' social interactions involving humor. living settings are guaranteed their own private rooms and bathrooms, thus eliminating one potential source of variability from the present study. Research has established that positive social interactions are related to older adults' mental health and well-being (Billings & Moos, 1981; Cohen & Wills, 1985). Such interactions, or exchanges, help older adults to maintain a sense of meaning in life (Krause, 2004), feel understood and appreciated (Rook, 1987), and experience a sense of self-worth (Krause, 2003). Conversely, the absence of social ties has been shown to put older adults at greater risk for depression (Oxman, Berkman, Kasl, Freeman, & Barrett, 1992;) and cognitive decline (Bassuk, Glass, & Berkman, 1999; Fratiglioni, Wang, Ericsson, Maytan, & Winblad, 2000). In fact, loneliness has been associated with an increased risk of late-life dementia (Wilson, Krueger, Arnold, Schneider, Kelly et al, 2007). Recent work has also begun to consider the detrimental effects of negative exchanges (see Rook, 1992). Negative exchanges can range in severity from major transgressions, such as physical or financial abuse, to minor annoyances, such as a thoughtless act by an acquaintance. Not surprisingly, negative interactions and social strain are potent factors in creating psychological distress (Antonucci, Akiyama, &