Benny (my wheaten terrier) used to sneeze when he got excited. And I don't mean little sneezes. Huge, gigantic, earth-shattering sneezes, 30/40 times consecutively. All we'd have to do was hold up his leash and there he'd go.
Scruffy (Poodle-Bichon mix) used to attack June Bugs (these horrible, disgusting flying bugs that we get in Canada). He'd pounce on one and then mame it so it couldn't fly. He'd then let it walk around the rug for a while, bat it with his paw, put it in his mouth and fling it over to the otherside of the room. The funniest is wehn he'd bite too hard and kill them. Then he'd sit there and bat the poor bug, trying to figure out why it wasn't moving anymore.
Scruffy also ate a whole stick of butter once, my brother's retainer, and my sister's barbie dolls. And he used to take his dry dog food, pick it up kernel by kernel, drop it in the water bowl, wait till it expanded, and then ate it. Weird.
Bosley (Schnauzer/Poodle mix - he's a schnoodle) plays hide and go seek. He always hides behind this one bush in the back yard, and when you put your head down and kneel on the lawn, he comes out to play.