Self punked

I recently tried to play a practical joke on someone. Well to make a long story short, instead of everyone having a good laugh, they got really mad. I didn't intend to hurt anyone's feelings, and I didn't think that anyone would take me seriously, but it happened. This is the second time in less than a month that I have made people upset while trying to make them laugh. I feel pretty stupid and even stupider because I'm still trying to figure out why it wasn't funny; at least a little. Oh well, I am used to apologizing.