We have heard the residents of Tallinn are solid Estonian citizens who would no more go in the street than moisten the pavement while the wife is watching. So this can’t possibly be what you expect. Our own theory is this sign dates from an unusually cold winter when the lake froze over and a lad was called in to save the local angling competition. That doesn’t solve the problem of his companion on the left. You don’t think he could be the umpire sitting on a chair with gas height adjustment… this is most peculiar!