Three locker room stories for you, some of which i may already have told:
1) the guy i regularly played squash with. We were both showering after he'd beaten me at squash. I guess he'd been plucking up courage for a while to say something, but he just suddenly commented how much bigger my soft dick was compared to his (tiny guy. 2 inch soft, maybe), and he started asking me about my erect size. I told him, and gave him an indication how good my sex life was, with my wife.
2) showering next to a stranger after using the gym, he turned and asked me what equipment i'd been using on 'that muscle'. I just joked that i worked out on it a lot at home.
3) just me and one other guy in the changing rooms. We'd showered separately, but he'd seen me naked. The cleaner knocked on the door to see if the changing rooms were empty, so she could come in and clean. Joking i shouted out 'Come in anyway, we're not shy'. Obviously, she didn't, but the stranger turned to me and said 'I bet you're not, with that between your legs'.