Once, I even put it in the freezer part... For what I thought was few minutes. At the end of the developer pouring in the tank, I heard and felt a "thunk"... Looking in the bottle, there was a white pancake of the active solution that couldn't go through the bottle neck... The film was already wet with something that was mainly water!!! In a frantic move, with a screwdriver, I broke the pancake to smaller bits, took them out, shoved them in the tank (in full dark), agitated... And invented on the spot a development time that neared tin-foil nerdism !
Those negatives was an important work and there was 6 rolls in the tank... Some time after, and after the fixing part, I got the negatives out with trembling hands... And they were far from perfect but usable under the enlarger (with some work) !
The client was happy and I learned a lesson :-) "What can I do, What can I write, Against the fall of Night". A.E. Housman