You won't believe this, but I've just ...
You may not believe this, but I've gone ...
You won't believe this, but I've worked ...
You won't believe this, but I've met ...
You may not believe me, but I haven't had ... since ...
As amazing as it sounds, I haven't seen ... yet.
You may not believe this, but I've never been to ...
This may seem hard to believe, but I've never liked ...
This may seem hard to believe, but I've taken ...
Believe it or not, I've woken up ...
This may seem hard to believe, but I've taken part in ...
You will find this hard to believe, but I've already ...
You may not believe me, but I've never tried ...
Believe it or not, I've always been good at ...
Would you believe, I've never been able to ...
This may sound unbelievable, but I've ...
This may sound unbelievable, but I've ridden ...
You'll find this hard to believe, but I've always been interested in ...
You may not believe this, but I've walked ...
Believe it or not, I've had ...
You'll never believe this, but I've visited ...
I know it's hard to believe, but I've never ...
As amazing as it sounds, I've never made ...
Would you believe, I've never had ...
This may seem hard to believe, but I've been to ...
You'll never believe this, but I've always liked ...
You may not believe this, but I've ...
I know it's hard to believe, but I've seen ...