I've had quite a few, especially about a year ago when I started wearing more consistently.
One of my favorites was when I was at my desk at work and I wet my pants. My boss, a very attractive woman in her early 30s, shuts the room down, locks up and takes me to the closet. She unbuckles my belt and tells me to lie down, and she diapers me. It appeals to my big sister/little brother fantasy.
Another one is me back in high school, waddling around in soggy Pampers. I'm trying like hell to get out of the crowd when someone grabs me by the arm and takes me into the girls' bathroom. It was my old high school crush, and she's ready to change me. So she changes me, being so sweet and delicate with her hands, and as I hug her and thank her, she stops me as I'm about to leave. "Whoa, she says, "aren't you gonna return the favor?"