That blue shell is almost always flying at the last lap which sends you off to 6th-8th place. It can't be just me, and this always seems to happen RIGHT BEFORE YOU'RE ABOUT TO GET 40/40 POINTS.
This has been my problem with Special Cup. I've been trying to get 3x Gold Stars on that cup because it's the last one in the second tier of the Grand Prix. These ****ing blue shells are being tossed at you at the most inconvenient times. I ragequit erry time.