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