Human magnets are people who can stick various metallic objects to their skin for some time, allegedly due to some kind of "magnetic" properties.
While it's a neat parlour trick, this is nothing paranormal. The "stickiness" is explained with literal stickiness — the natural skin secretions of these people make their skin unusually adhesive. This also explains why "human magnets" can "attract" non-magnetic materials like aluminum and plastic. James Randi has dealt with several of them and suggests using talcum powder to dry the skin before testing. Another possibility is using a thin sheet of (dry) plastic - in both cases, the thin layer of material wouldn't be a problem for a true magnetic field. 
- Archive copy at the Wayback Machine "Same Old Magnetic Flummery", Randi's SWIFT Commentary, 27 August 2004
- 'Magnetic' boy shows off skills (video), Telegraph.co.uk, 13 May 2011
- Archive copy at the Wayback Machine Talcum Powder Cures Magnetism], Randi's SWIFT Blog, 17 May 2011
- https://www.forbes.com/sites/startswithabang/2021/06/23/the-unfiltered-truth-behind-human-magnetism-vaccines-and-covid-19/?sh=15c29e2a540c | The Unfiltered Truth Behind Human Magnetism, Vaccines, And COVID-19, Forbes — retrieved 8/4/2021
- https://sciencebasedlife.wordpress.com/2012/03/14/are-there-really-magnetic-people/ | Are There Really Magnetic People? from the Science-Based Life ~ Add a Little Reason to Your Day blog — retrieved 8/4/2021