It can never be opposite day. When ever you say "HEY IT'S OPPOSITE DAY!" the opposite would apply therefor it would not be opposite day. Also if you say "IT'S NOT OPPOSITE DAY!" the affect is not applied.
Every minute, a poor weasel dies from starvation due to unemployment. You, yes, YOU nl_Kripp, can make a difference. By playing at least one weasel in every deck, you ensure a living wage for weasels worldwide. Then again, you could just let them starve, the choice is yours