1) Always needing so much space to do your homework
Between the giant textbook, notebook, laptop, and calculators there isn't very much space left on your desk.
2) Overthinking simple things when you go out
"I wonder what method of depreciation they use for their equipment."
3) When you don't balance after finishing a long problem
The worst feeling is spending so much time working on a long problem and getting to the final step only to realize you are not in balance.
4) Excel
Excel is both a blessing and a curse. Once you are familiar with it, it can be very helpful. Make sure to keep saving it as you work.
5) Always thinking about numbers
I am always the first person in my friend group to split the bill or figure out how much the shirt is after a 40% discount.