1,343 (I think, was about 1,300 anyway) on the lottery. 5 balls. 6 quid ticket.
Best return to stake was a slightly mad accumulator one of the lads in work suggested which I got a grand on for 4 quid as thats plus the betting tax was all I had on me in coins at the time... he put fifty quid on the same. The bastard. He's usually loosing on the horses so I wasn't going to even put anything on.