Two questions for old programmers

Question

So I've been using QBASIC64 today... for old school's sake.

I was wondering:

a) What is the most complex QBASIC code you have ever written was
and
b) What is the most useful code you have written

(examples would be nice but not imperative ^_^ - and this is Community Wiki and just for fun)

Answer 1

GOTO used to be so easy those days :-)