Among field troops in Vietnam it became common knowledge that ingestion of a small amount of C-4 would produce a “high” similar to that of ethanol. Others would ingest C-4, commonly obtained from a Claymore mine, to induce temporary illness in the hope of being sent on sick leave.
https://en.m.wikipedia.org/wiki/C-4_(explosive)
Huh. Not as bad as I expected. Also I am somehow not surprised that this has actually been done enough to be documented
Documented? They print a warning on the block packaging now.