Mercury thermometers are handy and useful, but they could be extremely dangerous to bring on planes.

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Sources:
References
http://www.sciencedirect.com/science/article/pii/S0010938X06001028
http://www.airliners.net/photo/Air-Niugini/Fokker-100-F-28-0100/1132825
https://www.planespotters.net/airframe/Fokker/F100/VH-FKE-Alliance-Airlines-(Australia)/jPlrCodN
https://www.ec.gc.ca/mercure-mercury/default.asp?lang=En&n=10C3AF2D-1
http://www.colgate.com/en/us/oc/oral-health/procedures/fillings/article/dental-amalgam-a-health-risk
https://education.jlab.org/itselemental/ele080.html
https://www.faa.gov/about/initiatives/hazmat_safety/more_info/?hazmat=56

Video Source:
https://youtu.be/IrdYueB9pY4