When I was playing WiFi, I was in first place in the final lap with a mushroom left, on Toad's Factory on the final stretch. A blue shell was coming up on me, when it was supposed to hit me I had already started cursing very loudly, you know, other things that can signify your frustration. Took me a couple seconds to realize that it didn't hit me, I actually wound up winning the race. Turns out I used the mushroom at the moment right before the shell hit me and it ended up exploding behind me. I never even knew you could do that and I thought it was the coolest thing ever.