related: if you really wish to know someone's L1 and suspect that the language they count in isn't it, hit them with a $5 wrench and see what language they say

related: if you really wish to know someone's L1 and suspect that the language they count in isn't it, hit them with a $5 wrench and see what language they say "ow!" in. (my L1 is english but I can make two kinds of 'ch' sound, neither of which is the english "tsh" one, so I suspect the wrench test, while far from perfect, may still be better than sibboleths)