That said, it's certainly better if your exam subjects are suffering from dementia, so they can't memorise the answers ;-)
Despite this paper (and most forms) clearly specifying "three objects", I've always seen this taught as three random/arbitrary words of different "types" - adjective/noun/verb, person/place/thing - or just "two common objects" instead of exactly a pen and a watch.
It's always fascinating to me when patients come up with incorrect-but-clever words for common items: "cutters" for scissors, "timeclock" for watch, "cigarette starter" for a lighter, etc.