Is there a way, without intentionally corrupting the code in some way, to force a procedure to go to its error handler?

For testing and demo purposes I would like to insert a line or two of code that would cause the procedure to go to the error handling routine. I tried inserting a line like Err = 70, but it did nothing, nor did it cause any problems in the normal execution of the procedure. Obviously any such code would be commented out or deleted after testing and/or demo.

Thanks in advance.