I hate people who hand out flyers. Especially the ones that follow you until you do take a ticket.
Keep taking flyers off them until they decide they have had enough. Then hand them back to them.
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Shop assistants who follow you around the shore when you ask them not to.
Pick up a shopping basket or trolley and fill it up to the top. Walk to the till and remove the one item that you want and pay for that leaving the trolley there. Or just leaving everything there and walkign out.
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Tailors asking if you want a suit made in HK.
Follow them round and ask them to make a suit for your (select item of choice) water bottle etc. Acting serious about it and haggle with them for a while.