It sure would explain the inopportune laughing...
http://www.pbainfo.org/science
PseudoBulbar Affect (PBA) symptoms are frequent, uncontrollable outbursts of crying or laughing in people with certain neurologic conditions or brain injuries. PBA is not a new condition. In fact, it was first described in medical literature over 130 years ago by Charles Darwin.
PBA can occur when certain neurologic diseases or brain injuries damage the areas in the brain that control normal expression of emotion. This damage can disrupt brain signaling, causing a ‘short circuit’ and triggering involuntary episodes of crying or laughing.