Omniglot
an omniglot is a hypothetical polyglot that does the same thing in every language. omniglots are impossible, due to the conflicting nature of the following languages:
omniglot d1
commands:
a - print hello world e - end
every other symbol throws an error, and the script has to end with an e for end
omniglot d2
commands:
a - end e - print hello world
every other symbol throws an error, and the script has to end with an a for end
disproof
omniglot d1s hello world program is ae
omniglot d2s hello world program is ea
now you may be asking "this omniglot is simple! just use aeae!"
that wouldnt work because omniglot d1 programs need to end with an a, so this wouldnt work.
even if omniglot d1 allowed things after the end, it would still end immediately.
there are many languages like omniglot d1 and d2, i didnt just come up with it on the stop to disprove this.
there is no possible omniglot you could possibly make with these two coexisting.