Sounds good to me, how about we both exercise our immune systems - I'll give you as much time as you need then we'll both step on some rusty nails. I'll be taki

Sounds good to me, how about we both exercise our immune systems - I'll give you as much time as you need then we'll both step on some rusty nails. I'll be taking the vaccine. Don't worry though, since you've been robustly hitting the immune system treadmill I'm sure you'll be safe from the ravages of tetanus.