Irazú
...that the Irazú volcano in Costa Rica erupted violently in 1963, on the day U.S. President John F. Kennedy arrived in the country for a state visit?
...that the <b id="mwAZg"><a class="mw-redirect" href="./Irazú" id="mwAZk" rel="mw:WikiLink" title="Irazú">Irazú</a></b> volcano in <a href="./Costa_Rica" id="mwAZo" rel="mw:WikiLink" title="Costa Rica">Costa Rica</a> erupted violently in <a href="./1963" id="mwAZs" rel="mw:WikiLink" title="1963">1963</a>, on the day <a href="./President_of_the_United_States" id="mwAZw" rel="mw:WikiLink" title="President of the United States">U.S. President</a> <a href="./John_F._Kennedy" id="mwAZ0" rel="mw:WikiLink" title="John F. Kennedy">John F. Kennedy</a> arrived in the country for a <a href="./State_visit" id="mwAZ4" rel="mw:WikiLink" title="State visit">state visit</a>?