My coonhound was obsessed with those "drumstick" deserts - the ones with the chocolate coated cone, and the chocolate coating and nuts on the ice cream. Whenever we ate one she would sit in front of us staring intently. I know you're not supposed to give dogs chocolate, but we would always give her the end of the cone when we were done with it.
All three of my dogs were fascinated with bugs, they would run over to them and eat them like they were treats or something.
Our dogs also loved jumping in fresh laundry right out of the dryer. It was a pain in the butt trying to get everything folded and put away because they would lay right on top of it and roll around.
I've already discussed this in another thread, but my cats currently are obsessed with following me into the bathroom. Everytime I go in there they follow me in there and keep brushing against my leg repeatedly. It's kind of creepy, lol.