The Fairly OddParents - Season 2 Episode 18 -

Timmy tries selling lemonade to see Crash Nebula on Ice, but his lemonade tastes horrible. Timmy discovers that Cosmo's sweat makes the lemonade taste better, and adds it as his secret ingredient. His lemonade is now a success, but with an unfortunate side-effect: it grants the wishes of the people who drink it.