Certain foods present immediate hazards to birds. Sodas are loaded with sugar, which can cause hyperactivity in birds. A sink full of water, pots on the stove, even the toilet are all potential dangers to pets birds if they are unsupervised, and flighted. The lamps that have the open tops present a great hazard to birds. Woodstoves, obviously are very hot, and can cause injury if the bird lands on it.
Bells present a hazard because of the clapper.
If a bird has a strong enough beak, it can remove the clapper and possibly ingest it. Some clappers are attached better than others. Round jingle bells are not a good idea because small birds can get their beaks trapped in the slots on the bell.