Gee, I don't know if you can really tell.
But here's the story....
DD called from college one night all upset 'cause her hamster was dying. I told her that hamsters usually live for two or three years and hers was only about a year old so maybe it was sick but it wasn't dying of old age. That's when her boyfriend (i.e. "jerk") 'fessed up that he had bought her a used hamster and not told her. Someone else had it and didn't want it anymore so he bought it "cheap" for her and never told her!