Many threads like this pop up recently, can you demonstrate your skills on
12346d2306658364cc137d5b3224438835fc8d800911c21157a9bf3965a09d73 ?
It's not my transaction, I got it from
this thread. It has a low fee, and has been unconfirmed for 40 days. If you get this confirmed within 24 hours, I'll be impressed!
Update 2 days later: still unconfirmed.