If you like Forth, you should also try doing programming "by hand" in PostScript. Unix dc is another fun stack-oriented piece of software where you have operand operand operator -- that is, postfix like an RPN calculator. dc is great when you have a bunch of numbers to add, because you can review things even after you've finished the computation. (Of course, a spreadsheet is even better.)
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If you like Forth, you should also try doing programming "by hand" in PostScript. Unix dc is another fun stack-oriented piece of software where you have operand operand operator -- that is, postfix like an RPN calculator. dc is great when you have a bunch of numbers to add, because you can review things even after you've finished the computation. (Of course, a spreadsheet is even better.)