Because no signature or PIN verification is typically required, contactless purchases are often limited to a maximum amount per transaction, known as a Cardholder Verification Limit (CVM limit). Limits vary between banks.
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The UK ($120.65 or £100) has one of the highest card limits in the world and the largest in Europe.
You can't pay accidentally—your contactless card or payment-enabled mobile/wearable device must be within 2 inches of the terminal for the transaction to take place. And you won't be billed twice, even if you accidentally tap twice.
What happens if someone else uses my contactless card? As with unauthorized charges to any other cards, the bank will be liable, not you. If you suspect any unauthorized transactions, report them immediately to your card issuer.