''It was a slip-n-slide standing up [because] we were very sweaty,'' says Weatherly of his scene with co-star de Pablo in the season premiere of NCIS (airing Sept. 25), which picks up just hours after an explosion left Tony (Weatherly) and Ziva (de Pablo) stuck in an elevator together. ''Whenever Cote and I are trapped in closed quarters for a period of time, we always find new and interesting things to play with.''