A man convicted of forging a prescription in Thunder Bay, Ont., made a fatal mistake, a court heard this week: He wrote too legibly.

Gerry Arnould pleaded guilty Thursday to one count of uttering a forged document.

The man's neat handwriting drew the suspicion of staff at a Thunder Bay pharmacy when he handed over a prescription in June.

They also balked at the large amount of Percocet pills spelled out in the prescription, so they alerted the police.

After joking that Arnould might want to practise scribbling, the judge handed him a 30-day sentence.