A sign of getting older is that I am now unable to pipette out 25 mL each into 15 standard flasks at a time,  for the lab exam.... Something I did every year for batches of students, twice a year. I now use a burette or a pipette pump making the process a lot slower and tedious.
With a lot of effort, we organise a pre-final practical examination for our students -- exactly like the final practical examination in order to familiarise our students with the exam pattern and point out their mistakes. The students however, do not study for it and simply cheat, copy each other's titre values and ask each other how to calculate the result. Why do they not understand the purpose of a pre final exam? what purpose does the copying achieve?
I had organised a short course in bioinformatics, taught by one of our guest faculty. We asked for a feedback. I got the papers back today and the students have copied the response from one another. Why?
If I ask them to write an answer to "which flavour ice cream do you like?", they may need to look at their neighbour's paper and copy the answer....