My grandpa's giant orchid cactus.

That's fantastic. I'd like to see the flowers it has.

Hywel- If I'm there when it flowers, believe you me, I'll take a picture of it and of course share it with GOY :) Did you see the flower pics that I posted from a similar one awhile back? Must have been around June or July... They are quite spectacular! Here's a link to one such cactus:
http://www.theamateursdigest.com/epis.htm