Most expensive mug

According to Official Guinness Records,

The most valuable mug was made from 23 carat gold and bought for 1,000,023 Thai Baht (£17,293, $33,842) by Nestlé Thai Ltd. on 9 January 2008.
The mug was made by Yoo Long Kim Kee Gold Store, Bangkok, Thailand and given away as part of a promotional offer for NesCafé in Thailand. It weighed 1,092.5 grams.

For a complete list of 2008 records, please visit 2008 Guinness Records in Thailand.

Other Thailand records that might interest you:

• Heaviest weightlifting 85 kg snatch (male)
• Largest parade of tuk-tuks / autorickshaws
• Tallest proscenium
• Largest seafood stick
• Most expensive painting by elephants