I saw this on a channel that shows the tv listings and then has interviews with stars of sitcoms. I have this on tape but I have to find it. In the course of an interview, they show a clip of what looks to me like Debra Messing getting ribbed tickled by one of her castmates (in the context of an actual episode), giggling hysterically and then somebody, possibly her parents, walk in. In fact, this was the first time I had ever heard of Will and Grace and it would have been either the first or second season. (the interview was talking about how it's going into the second season).