Mario loves his two different kinds of everlasting treat balls. Only trouble is they are "shortlasting", not everlasting, around here
. I have to put the treats in upside down before they last long enough to make it worth the money.
Mario was afraid of balloons, but I got him over that. Then I had a plastic glass upside down on the floor protecting an area I had repaired and he went nuts over a cup in HIS floor. He managed to master that in a fairly short order too, but boy our world was noisy until then.