I usually don’t have one that’s severe as compared to others, but honestly I’m not sure. I’d say for most of my life it’s been repetitions (think Porky Pig-esque). But recently, I went through some pretty severe personal life changes that caused me to have complete mental blocks, where I couldn’t say anything at all including my close friends and family. I quit my job because of it. I’d say this has lasted for a little over a year now, but I think I’m finally regaining control of it again and it’s not so severe anymore.