When Chip and Dale pushes the pine cones over the hole in Donald's trailer they break his teacup, they push the rest of the pine cones and breaks more plates and hits his head twice. The pine cones in real life are very light and would not be heavy or strong enough to break Donald's cup or dishes. Chip and Dale would've been better off rolling heavy rocks and dropping rocks on Donald's dishes as they would be heavy enough to do damage to break his cup and plates and hurt Donald Ducks head.