A buyer who has reached a verbal agreement to purchase a boat commits forgery when he presents an agreement he himself wrote and to which he pasted the seller’s signature to a police officer who has been called to resolve a dispute arising from later disagreement as to the terms of the purchase. Contentions of improper prosecutorial argument were waived by the failure to object by the defendant, who represented himself. To paraphrase the court, he stumbled into one of the many pitfalls of self-representation.