As you are flying along supposedly straight and level.
Gently drift off the heading and lose a bit of height.
Keep repeating the exercise in loss of hgt and heading despite gentle reminders.
Wait until the instructor changes colour and then consider the exercise in Anger management complete.
It works best if you are receiving some type of ATC service where your instructor has promised you maintain hgt & hdg. Also try and arrange some cloud with other A/C in the vicinity, maintain your own composure and smile as if you are listening