Chara wasn't aware the balls on Mineta's head were sticky when they were still on his head, as a result, she ended up leaning on him once and she had a sticky ball stuck to her elbow for the rest of the day. Mineta teased her relentlessly for it and when ever they're fighting together, when Mineta throws one of them, he'll always say something like 'remember that one time you got one of these stuck on your elbow?' And she WILL threaten to murder him.