Signing bonuses you wouldn't be able to turn down

[Open123]

100K Prestige, should I ever receive the offer in the mail.

[Anonymous]

I would have loved to have gotten the Discover 2x promo.  I just found out a minute ago (a few posts up) that existing cardholders were eligible.

One I wasn't able to resist was the AA 50k bonus.  I got it the day they started pulling the ads down.

When I got my AMEX, it was I think a $250 credit for a $1k spend. That was well worth it.