Most expensive mis-click you have ever made?

not quite a misclick, but in a cash game had about $450 .. sitting with AA and in position

about 150 in the pot pre flop (raise, reraise, call)

flop AXX rainbow (something like A84 flop) i bet out half pot, got reraised, about to go all in and .....

Wife unplugs the wireless from the wall to plug in the vacuum cleaner...

laid a greyhound at 40/1 rather than 4/1 for £222. everything on the machine from 4/1 up to 40/1 obv got hoovered the dog was 2nd the whole way round never more than a length behind. stayed in 2nd at the line. hardest 30 seconds of my life. the graph on bf was very funny to look at. easy £222 made though in the end so it wasnt really expensive.

^^^^^^^^^ that is funny

Few years back had got in a bit of a mess with 22, after river board read KK776, miss clicked 'call any' just as guy bet around £600 (Pot only 80ish too) obviously with worst hand possible I lost, he turned over king, I showed my 22, everyone at table had a good laugh except me.
Now I'm 2 (3 at a push) tables max...

when spread fair was about tried to lay first 15 runs at 80ish and ended up laying inns runs at 80ih for £50pp. Was at about 4am when the bet was placed and then sat and watched them rack up 300ish.

Thankfully spread fair agreed to void the bet as clearly a palpable error (not something you'd get on betfair)

When i worked on here full time, we were laying the horses at Pontefract one day. I had a friend at the course and he reported heavy money for one nag so i had 200 on at 14/1. It went into 10/1 and i hit the lay button exactly the time the race went in play. For some reason the lay didnt appear on the screen so i panicked and hit the lay button for another 200 which was taken. Two seconds later the screen showed me that both bets had been laid and the horse bolted up.

i had £50 win on vortex in the royal hunt cup@100 and inadvertently had £500 on..i panicked and put in to lay allsorts in running and it thankfully all got swallowed up..horse came 3rd