Default Good Grief???

Why haven't the Foos played Good Grief in like nearly 20 years? yet it's one of their best songs? I would love to hear it live again. I was actually at the London gig on Friday and I made a sign asking for them to play it but they didn't acknowledge it but they definitely saw it though they still didn't play it.
Hopefully somebody who can contact them could ask them for me coz this question has never been answered.
Thanks
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