The text plays on the different meanings of 'compatible' and 'incompatible.' In a technical or relational context, 'compatible' means able to exist or work together without conflict, while 'incompatible' means not able to coexist without conflict. The joke twists these meanings to suggest that 'compatible' things will still 'blow up' or fail, just later than 'incompatible' ones, which is an unexpected and humorous interpretation.
Compatible : Blows up a little later than Incompatible