I read a sentence today that said something like, "it's so cramped, we'll all be crammed in there", which of course got me to thinking whether "cramp" and "cram" were from the same root. But no.

Cram, the verb, meaning to put something somewhere so that the space is completely filled, is from ME crammen, OE crammian to stuff, akin to crimman to put in.

Cramped, the adjective, meaning constricted in size, is from cramp, from ME crampe < OF < Gmc; c. MD crampe, OS krampo, OHG krampfo.

My investigation lead me to learn that "cramp" is also the name of a kind of clamp, and that clamp is from ME (n.) < MD clampe clamp, cleat; c. MLG klampe.

Also, that "cram" in the sense of stuffing as much knowledge as possible into a brain just before an exam dates back 200 years.

So, I've no questions, but I wasn't going to look that stuff up without telling you about it. Now, talk amongst yourselves.