I just start repeating a mantra in my mind, that goes something like this

"Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out, Margret Thatcher on a cold day with her tits out," that generally keeps it going! if it doesnt stop it all together!