Pen.

[Patsy33]

Paddy said to Mick, "I've just found a pen"
Mick said, "Throw it here" He proceeded to write on a bit of paper. "It's mine!" he shouted. Paddy said, "How do you know that?" Mick replies, "Because it's in my handwriting!....

[marval]

lol

[zebo]

He is later writing home to his Mam, 'Excuse the scrawl, I'm having to write fast as my pen's nearly out of ink'.