https://en.m.wiktionary.org/wiki/Appendix:English_contranyms

Int3 is a special single-byte (CC, if I recall correctly) form of the INT instruction (which is CD imm8, I think) to raise an interrupt. Interrupt #3 is the debugging interrupt, so by overwriting any instruction with CC, you place a breakpoint there.

In a bank we work for, there is a mandatory security training for employees, mandated by the parent supranational. The bank tried to correct the mistakes in the training or at least make the training optional, as the bank provides its own, more correct program. Rejected by the mother company, mandatory training is mandatory, even if it is wrong.