thats right. letters are just arbitrary little squiggles, and if you look at any of them too long they lose the heuristic you associate with them and the fact that theyre just little squiggles becomes visible.

I dont think one word or another is more or less likely to cause this effect.

Uninflammable

I see it, and I cannot unsee it. Well done

Boob looks like boobs (top view B, front view oo, side view b)