Would you believe, I've never had ....
...
You'll never believe this, but I've always liked ....
....
You'll find this hard to believe, but I've always been interested in ...
...
This may seem hard to believe, but I've been to .....
...
I know it's hard to believe, but I've never ....
....
This may seem hard to believe, but I've never liked ....
....
You will find this hard to believe, but I've already ....
...
You may not believe this, but I've never been to ...
...
Believe it or not, I've had ....
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You may not believe me, but I haven't had ..... since ....
...
This may sound unbelievable, but I've .....
....