(If these seem a little football-centric, that’s because I watch more football than any other sport. Sorry about that.)

Opening ceremonies
Intrusive animated pitchside advertising hoardings
Sepp Blatter
Diving (other than in the Olympic diving pool, that is)
Synchronised swimming
Debt
Football DataCo Ltd
Stupid hairstyles
Pre-arranged goal celebrations
Restrictive marketing tie-ins
Agents
Mobbing the ref when the decision goes against your team
Over-priced replica kit
People who are stupid enough to buy over-priced replica kit
Stupid clothes
Sport Relief
Celebrity fans
Politicians
Half-time entertainment anywhere other than the Superbowl
Closing ceremonies