Honest...
me + others, 8pm at night walking into some woods heading for an old quarry in full 'underground gear'...
"oo you going underground" a passerby says, yes we are, wanna take a 5 min look, i'd be happy to show you round.
"Naa", says the passerby, looking up at the night sky, "bit dark ant it!"... :?
Others include
"Naa, its a bit cold and wet outside today..."
"Its blowing a gale outside..."
"I was underground yesterday..."