No it's not an optical illusion or camera trickery Dan got 5 birthday cards exactly the same with the final one arriving today.
2 is a coincidence
3 is funny
4 is hilarious and
5 is blip worthy

They have terrible jokes, one that sticks in my head is:
What goes cackle cackle boing?
A witch laughing her head off.

There you go your day, week, even year is now complete!

Dx