I had the "loop" of the dipstick snap off on my Magnum, leaving the stick (the whole thing!) stuck in the tube. (Per my wife: my facial expression was truly priceless.)
I took it to the dealer, and nobody had ever seen THAT before...after the service manager and every mechanic in the shop tried (unsuccessfully) to fish it out with pliers, they said they'd have to pull the tube. They wanted me to leave it overnight so they could work on a cool engine. (Which I found entirely reasonable.)
They wound up replacing the dipstick and the tube...the service manager gave me a free loaner (PT Cruiser), all I had to pay for was about $30 for the replacement dipstick. (The car was out of warranty.)