According to a new survey from Vault.com, 58 percent of employees say they participate in an office betting pool, and 77 percent report that their co-workers participate. The survey conducted in February covered 638 employees representing various industries across the U.S.

The most popular office betting pools employees say they participate in: the Super Bowl (51 percent); followed by the NCAA men’s basketball tournament (48 percent). Other office pool events: NFL regular season games (32 percent), co-worker pregnancies (13 percent), and the Oscars (12 percent). Most employees (91 percent) either said their company did not have a policy against office betting pools or that they were unaware of one. According to the survey, 68 percent of the respondents said they spent five to ten minutes out of the work day to make their picks; 72 percent said the primary motivation for office pools is to have a little harmless fun at work.