火燒旗杆——長嘆

Etymology
A wooden flagpole after being burnt is a long piece of charcoal, which is homophonic pun on.

can mean "sigh" or "to enjoy" in Cantonese.

Idiom

 * 1)  to have a long sigh (because of helplessness, etc.)
 * 2)  to enjoy life for a long time