I imagine this only happens very rarely, but in my most recent game, we grabbed so many fat powerups that our curves took up the entire screen.
This may have been fine on its own, and probably makes for a nice laugh, but the problem comes in if your curves happen to jump while that large. When your size is increased, your jump size is also increased; and because of how large we were, it took nearly a full minute before our jumps ended and our game could resume. This problem could be avoided/lessened if they add a max size one could reach.
I wasn’t able to catch the moment our curves were larger than the playing field, but I was able to catch some of the aftermath.