“Anything you say will be used against you” is kind of a weird-sounding sentence, but it clearly means the same as “Everything you say will be used against you.” Both mean “If you say things, each one of those things will be used against you.” The word “will” makes it clear that the predicate “be used against you” applies to all things said.
However, “Anything you say can be used against you” doesn’t mean quite the same as “Everything you say can be used against you,” because the latter definitely implies that it is possible (though not necessarily inevitable) for a trial to occur in which every single thing said by the defendant is used against him, whereas the former could possibly (but does not necessarily) refer to a situation where there is a limit on how many of the things said by the defendant can be used against him.
I thought of offering this as a guest strip for Left-Handed Toons, but then I would have had to draw it with my left hand. It wouldn’t have looked much different, since drawing an Abby and Norma comic is basically just copying and pasting, but it would have taken way too long.
Oh, and four is the only number that is equal to the number of letters in its name! And, and two and six are the only ones with only one vowel, except for ten, but ten doesn’t count because I’m talking about the first ten numbers, and I’m counting them starting with zero. See, Hans? I can totally do math!