Submitted by algebraic-dumbass
Decide to give up on the problem only to come back to it five minutes later.
Submitted by coffee-math-chamomile
Completely summarise a course from 3 semesters ago as a 5 min remark.
Submitted by coolduucks
Try to win a goat on the Monty Hall Show.
Submitted by ilex-merciae
Do dimensional analysis on an equation because you've forgotten this is pure maths and not physics.
Submitted by thegrayearloftea
Look at an nLab article and leave with more questions than answers.
Submitted by ilex-merciae
Approximate an uncountably-infinite-dimensional space as 2-level system.
Submitted by coolduucks
Explain the basics of calculus to a five year old :)
Submitted by ilex-merciae
Write something that is not a linear transformation as a matrix.
Submitted by idon-twannabeperceived
Forget calculator at home.
Submitted by algebraic-dumbass
Replace your map by a (co)fibration.
Submitted by ilex-merciae
Forget to send a new submission to your favourite math blog for a while.
Submitted by algebraic-dumbass
Scribble on a piece of paper like a maniac.
Submitted by tenderwasthekiss
Leave the proof as an exercise to the reader.