I had same thing happen to me yesterday evening around 7pm. It was only a little amount and mainly liquid, but managed to leave a nice streak in my boxer briefs and soak into my sweatpants. So cleanup, change clothes and a quick laundry of said items.
I really think it was the buttered popcorn from the movies at 2:30pm, and I had just finished dinner 20 minutes earlier. 2nd time this has happened to me in the past 6 months. As I wasn't diapered at the time, not so fun.....