In real life, concussions have a number of unpleasant symptoms. These include, but are not limited to headache, nausea, and dizziness. They also involve minor brain damage in addition to those. Fortunately for our protagonist, this is fiction. Here, if one gets a Tap on the Head or a particularly violent Dope Slap, one need only worry about sporting a dopey grin and falling over, or, at worst, experiencing a Non Sequitur Thud. In fact, the effects of Slapstick concussion look alarmingly like the effects of euphoric drugs. Related to Hard Head, Tap on the Head.