Saboteur on a petty level

• Misery, as loot gets left
• No barrel of laughs
• Killjoy
• Plunder left for killjoy
• (informal) someone who spoils the pleasure of others
• Kill-joy runs harbor for ill-gotten gains
• Coddles wine

Wiktionary Word definitions in Wiktionary
n. Someone who put an end to other's fun, especially harmless fun.

WordNet Word definitions in WordNet
n. someone who spoils the pleasure of others [syn: killjoy , wet blanket , party pooper ]

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM OTHER ENTRIES ▪ "I don't think we should go in there - someone might see us." "Oh, don't be such a spoilsport - come on!" ▪ Don't be a spoilsport , Richard. Come play with us. EXAMPLES FROM CORPUS ▪ And last night they were branded spoilsports ...