The danger of jumping on a trampoline, especially the danger of doing "rocket jumps" with other jumpers at the same time, is open and obvious, and should be appreciated by a reasonable person, even if she is only 15 years old. Thus, as a matter of law, the trampoline manufacturer had no duty to warn, and summary judgment for the defendant was proper. This is the result whether it is a products liability or premises liability case. The Illinois Supreme Court so held in Sollami v. Eaton, Dkt. Nos. 91284, 91378, 201 Ill.2d 1, 772 N.E.2d 215, 265 Ill.Dec. 177 (June 6, 2002).