yes, i've had cold-hardened nipples. no, it was never the wrong time, as i don't think having hard man-nipples really affects anything and thus there is no right or wrong time for such a phenomenon.
I absolutely hate that shit. Random hardons can be quite embarrassing especially when you have a good amount to cover up
Every time I feel that certain tingle in my balls, I know an erection will surely ensue.. It's soooooo embarrassing...
the math class hardon we have all had "mister <lastname> could you please come up to the board and show us how you arrived at that answer?" "um.... no, no I can't....."
Oh, well than that leaves the obvious...My balls must be extremely manly...I can smell the musk of them already... One of my boobs is bigger than the other, so one nipple is in a different location then the other...