On this post you can mention funny birthday cards you’ve sent or received.
I sent my brother-in-law one:
Front: two cavemen and the first one says “As soon as fire is invented I’m so going to light my farts” and the second one replies “Me too”.
Inside: I hope your birthday makes history. (My sister informed me he laughed out loud cause that is so him).

I failed to see how what is printed on the cavemen card's front could be related to people's birthdays!

Well then it’s obvious you didn’t read what I said was on the inside which I posted on the post. I’m just quoting what it said on the front which is the funny part. Have you ever received a birthday card? If so then you should know how they are printed on the front and inside. Usually the front is the start of the message of the card which can be important to the message found inside.

Oh, so the inside part is preprinted and not written by yourself as I thought. Okay, now I've got the funny.

I sent my brother a birthday card that said something like, "Have you ever experienced Deja Vu on your birthday?" The same graphic and words were on the inside of the card, so when it was opened the recipient would experience Deja Vu.

Then I sent him the exact same card the next day.

Good one .

Oh no I didn’t write the quote on the card on front or inside but I did write “Love, Julie”. All the other stuff was already printed on the card.

Sent another funny one to my B-I-L one year and it reads as follows:
Front: Fat man in the living room looking for the remote control and he yells to his wife “Honey, have you seen the remote?” when it’s stuck between his butt crack.
Inside: I hope your birthday is a real crack up.