[PatrickHenry]

01 INPUT "What's your name?", $x
02 PRINT $x is a stupid name!
03 INPUT "Are you a creationist?", $y
04 IF $y="yes" GOTO 10
05 IF $y="no"
06 PRINT Well, $x is still a stupid name!
06 END
10 PRINT You're a flaming idiot!
11 GOTO 10

[Junior]

You have an endless loop there at the end.

[VadeRetro]

Statement 5 could suffer a deletion mutation without loss of function.

[Ichneumon]

Under MS-Basic, at least: The dollar signs go *after* the string variable names. String constants on lines 2, 6, and 10 are missing the necessary quote characters. Line 5 is a syntax error (needs a "GOTO" or "THEN" clause after the "IF" test). Line 5 is redundant anyway, since it's the fall-through from the comparison to "yes" on the prior line. There are two lines numbered 6, which will cause the first one to be replaced by the second one, thus the program will silently exit if the user responds to the question with anything other than "yes".

On the other hand, the infinite print loop appears to be a feature, not a bug.