When the conversation in the riding group turns to food then you are approaching Bonksville I have found.
I get a clear mental picture of what I need to eat (usually this picture has me sat in the Friar Tuck, in Amesbury, with a full English. There's a Purple Giraffe sat in the corner, wearing sunglasses and writing something on a pad. I don't think this has anything to do with Bonking though)