Not technically a “danger, danger” sign, but your post reminded me of when I was in Sri Lanka in a group where I was the only foreigner, and my hosts explained to me that the signs written in 3 languages outside various points of interest did not say the same thing in each language: in English they would say the entrance fee, using a cardinal number, but the Sinhalese and Tamil sections would say “if you can read this, the fee is…” (and then write out the number, which would be anything from 1/4th to 1/10th of the number given in English).
Which seems perfectly fair to me!