I've been making animated invitations to my Halloween parties since around 2001! For years I made them all in Flash, so those animations aren't around anymore. In recent years I've been formatting my invitations as videos so they can stream to any device; those are all below!
Halloween 2019: Summer Camp Slasher
Halloween 2018: Gingerbread House
Halloween 2017: Tomb
Halloween 2016: Seance
Halloween 2015: Voodoo Bayou
... I wish I still had all the older ones!