edit: Perhaps I shouldn't had posted this on april 1st, but THIS ISN'T A JOKE!
IF you don't believe me, download the block and see for yourself:
Some time ago I was working with Guy Ziv's advanced display text block for NXT-G. I noticed something rather strange. everytime I selected the block, something appeared in the "display preview window" I couldn't see it properly, it is only there for a fraction of a second, a short flash. I managed to take a screenshot, and I was utterly surprised...
I saw a bald eagle!
I'm not shure wether this is a weird glitch, or a "easter egg" planted in by Guy.