What’s your way of saying ‘Sorry’ to clients?

how do you go about fixing this so you don’t become known as a freelancer-from-hell?

I’ve heard of some of the following options:

• Provide Starbucks gift card to smooth things over
• Provide a hefty discount for the current project
• Offer a heartfelt, in person, apology
• Handwritten note of apology
• Eat the cost of the project – no satisfaction, no payment expected
• Offer up your first born (my parents kept trying this, but unluckily for me, no one took them up on it!)
• Ignore it.  It’s the client’s fault for not being clear enough

Everybody makes mistake at some point and most of the time unknowingly or out of ignorance. If I had done a mistake unknowingly, I will first admit that it was my mistake. Second I will say ‘Sorry’ promising myself to be extra careful next time the mistake should not be repeated.