Police officers and emergency room workers may provide anecdotal proof that 911 calls increase during a full moon, but there isn't any hard evidence to back up this assertion. Though many people assume that there is a connection between the full moon and crazy behavior, scientific research does not support this assumption.
Statistics tend to disprove that 911 calls spike dramatically during the full moon phase, but there could be a logical explanation for why this part of the month seems busier than others. The full moon provides more light and is a beautiful attraction, which might draw people out of their homes at night. This may provide more targets than normal for opportunistic criminals who tend to operate at night, including burglars and muggers.