If youre looking for something funny to write in a birthday card, here are some ideas to get you started:

1. "Happy birthday! Youre not getting older, just more distinguished... like a fine wine or a stinky cheese."

2. "Another year older and still no superpowers? What a ripoff! Happy birthday anyway."

3. "Happy birthday to someone whos not quite old enough to know better."

4. "Youre not getting older, youre just leveling up! Happy birthday, gamer."

5. "Happy birthday! Youre not old, youre just a classic."

6. "Another year of wisdom and experience... or at least thats what well tell ourselves. Happy birthday!"

7. "Happy birthday! Youre not just a year older, youre a year better... at least thats what well tell ourselves."

8. "Happy birthday! Youre not old, youre just chronologically gifted."

9. "Another year of being fabulous! Happy birthday!"

10. "Happy birthday! Youre not just aging, youre becoming a classic... like a vintage car or a fine wine."

Remember, the key to a funny birthday card message is to keep it light and playful. Dont be afraid to use puns, jokes, or witty one-liners to make the recipient laugh. And if all else fails, you can always fall back on the classic "Happy birthday!" with a smiley face or a heart.