I dont think this is stupid but I probably looked stupid!! 
Whilst doing my 1st half marathon today, got near the the 13m marker and looked at my watch and was 10-20 secs over 1:39 and wanted a sub 1:40 time as a few seconds would of haunted me so off I sprinted and actually shouted 'COME ON!!!!!!!!!!!!!!!" at myself to sprint for the line!! 
Probably looked an idiot but finished in 1:39:59:32 on my Garmin and 1:39:54 chip time so i'm happy!!