Loosen the laces, during your break go for a run outside until you run out of your shoes.. keep running from 2mins after you lose them then go back and look for them in just your socks.
(Bonus points do this when it is raining, you can take your socks off for the rest of the day if they get damp)
During a lesson take your shoes off and leave them within easy reach of someone nearby.
During a lesson you cannot leave until you have swapped socks onto your opposite feet.
Without your shoes on "accidentally" touch your foot against someone under the table.
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