Wasps are dangerous creatures unless you are allergic to them  because of that many people are allergic to them.  Most times Wasps are harmless unless disturbed.  In the episode the Coven, the wasps was placed on the roof and seem to came to life when the owners son came on to the roof to fix it.  The wasps seem to be under the curse of the house.  Attacking anyone who disturbs the house.
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