I am not mistaken . . .
I am not certain whether . . .
Like every other man/woman . . .
I have my own opinion on it, but . . .
I am not an expert, but . . .
Quoting
She said something like . . .
My wife/husband pointed out that . . .
Recently, I heard that . . .
My better half said . . .
Switching
Now it occurs to me that . . .
By the way . . .
I have an interesting story about it.
And besides that . . .
Oh, I nearly forgot . . .
And one more thing . . .
On the other hand . . .