There are, of course, also *anti*-Scottish jokes:

A Scotsman sends his pants to the laundry with his socks in the pockets.

A Scotsman & a Jew went to a meeting together. Unexpectedly, a collection was taken. The Jew fainted, and the Scotsman carried him out. (George Orwell, who told this joke in his essay on antisemitism, remarked that it would have seemed vaguely wrong if it had been the other way about.)