Stuck in the pipe. Clogging up the pipe. Lodged in the pipe. You can't wiggle free, and the process of trying makes you get stuck even more firmly, but you never stop trying: for days and days you wiggle, shedding bits of flesh, but you never get out. Mindlessly, hopelessly, helplessly, you continue struggling till your brain finally dissolves to mush.
Not that it makes much difference to you anyway.
The End.