I don't have any jumpers but once one of my bettas jumped out of it's cup! I heard a "Flop Flop" sound on the counter, looked over and it was Cosmo! I put him in the net and he was fine, thank God.
I will never touch a fish because I am afraid I am going to spread desease to my house because I don't wash my hands well enough or something. I always put a BOATLOAD of soap on my arm after waterchanges and I still don't think that's enough. I don't use the counter I did waterchanges on for food after 3 days even though it's been disinfected. (Sp.?)
"Do your duty in all things. You cannot do more, you should never wish to do less."
~Robert E. Lee