I Feel As If I Have Foamy Urine On A

I feel as if i have foamy urine on a regular basis, however im curious if it is caused by the impact or if its just normal. When i urinate on the inside of the toilet bowl (not the water) it does not become foamy, however when i directly urinate into the water portion of the bowl it seems as if it is foamy. What do you think it iS?