There's only one thing not to do

Pastor's Challenge Shocks Congregation

Don't put the money in the bank to give it back with the interest. First of all, 1/4 of 1 percent interest (on a basic savings account) adds up to nothing on $50 and you'll lose 20% or more to service charges.

(I'm not sure that the paster has a complete grasp on what Jesus meant in that parable.)