good old superglue!

Toluene diisocyanates are reasonably anticipated to be human
carcinogens based on sufficient evidence of carcinogenicity in
experimental animals (NTP 1986, IARC 1986, 1987, 1999). When
administered by gavage in corn oil, commercial-grade toluene
diisocyanate (analyzed as 85% 2,4-isomer and 15% 2,6-isomer)
induced hemangiomas in the spleen and subcutaneous tissues,
hepatocellular adenomas, and hemangiosarcomas in the liver, ovaries,
and peritoneum in female mice; subcutaneous fibromas and
fibrosarcomas and pancreatic acinar cell adenomas in male rats; and
neoplastic nodules of the liver, pancreatic acinar cell adenomas,
mammary gland fibroadenomas, and subcutaneous fibromas and
fibrosarcomas in female rats.