A product whose demand is price elastic is one that is easily avoided if the price is too high. Products in this category would be considered luxury items, as opposed to necessities.
In hard times, few people are willing to spend a significant amount of money for entertainment and amusement. So I would pick Movie Admissions and Sporting Events as products whose demand is price elastic.
Substitutes for these products would be DVD rentals (for Movie Admission Tickets) and watching sports events on TV (in lieu of actual game attendance)
Complements would be Pop Corn sales at the movies, and Beer and Hot Dog purchases at actual sporting events.