Silly String. It’s awesome for pranks or party shenanigans, but this foam could also save your life someday.

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Sources:
http://cen.acs.org/articles/87/i43/Silly-String.html
https://www.britannica.com/science/surfactant
https://www.wired.com/2015/10/whats-inside-silly-string/
https://www.whysprayfoam.org/what-is-spray-foam/
http://www.cbsnews.com/news/a-serious-use-for-silly-string/
https://dii.americanchemistry.com/Diisocyanates-Explained/What-Are-Diisocyanates/
https://www.epa.gov/saferchoice/chemicals-and-production-spray-polyurethane-foam-why-it-matters
http://www.lsta.lt/files/events/28_jarfelt.pdf
http://www.azom.com/article.aspx?ArticleID=8097
http://www.metalfoam.net/
http://www.fuelcellmarkets.com/content/images/articles/white_paper1.pdf
https://www.youtube.com/watch?v=ZcE-Hhtynf0
http://www.azom.com/article.aspx?ArticleID=10529
http://energy.gov/energysaver/insulation-materials
http://arris.partners/news/3-uses-metal-foam-arent-armor/
https://www.disabled-world.com/assistivedevices/prostheses/metal-foam.php
https://www.jim.or.jp/journal/e/pdf3/52/04/728.pdf
http://www.sciencedirect.com/science/article/pii/S0263822315000434

Images:
https://commons.wikimedia.org/wiki/File%3ASilly_string.jpg
https://commons.wikimedia.org/wiki/File%3AGuesnain_(10_mai_2009)_parade_030.jpg
https://commons.wikimedia.org/wiki/File%3AU.S._Marine_Corps_instructors%2C_top%2C_with_the_2nd_Combat_Engineer_Battalion%2C_watch_as_Marines_with_Kilo_Company%2C_3rd_Battalion%2C_4th_Marine_Regiment_check_for_trip_wires_during_counter_improvised_explosive_device_130402-M-RF397-076.jpg
https://commons.wikimedia.org/wiki/File%3AAluminium_foam.jpg
By Stehfun (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html)