You won't believe this, but I've worked ...
This may seem hard to believe, but I've taken ...
You may not believe this, but I've ...
You won't believe this, but I've just ...
Believe it or not, I've always been good at ...
You will find this hard to believe, but I've already ...
You may not believe this, but I've walked ...
This may seem hard to believe, but I've taken part in ...
I know it's hard to believe, but I've seen ...
You may not believe this, but I've gone ...
You won't believe this, but I've met ...
This may sound unbelievable, but I've ...
This may sound unbelievable, but I've ridden ...
You'll never believe this, but I've visited ...
You'll find this hard to believe, but I've always been interested in ...