my mom has primary bowel and secondary liver cancer and has recently begun chemotherapy treatments. it's absolutely the worst feeling thinking about her attached to that pump she carries around and just thinking about it all makes me wanna break down, but i think i can help with your question.
since my mom is at the hospital one day out of 10, for 7 hours straight, she has purchased a canvas bag in which to carry some goodies. she has a crossword puzzle book, a novel, a change purse (with change for coffee and the vending machines, heehee) and stuff of that sort. just things to keep her occupied when having the tubes put back into her chest.
not sure if your friend is at the hospital like that as well, but if he is, try to find him things that will keep him occupied. try to be silly with it too, it'll brighten his day.
hope this helps.