Here is a picture of a wave that has just smashed into a 36 feet high cliff, (you cant quite see this cliff, but its about 60 yards away from where the photo is taken)the top of this wave is at least 70 feet high.
I'm sure Tailor Marc can work out where its taken from and then confirm just how big it is. I do have some video of the 25-30 foot swell. Its 10Mb so a little awkward in its size. Even this does not do the wave justice. If anybody wants a copy let me know, I'll email it to them.
Stax