I have a few, one special one was during the Crush tour, in Dublin, The concert went ahead despite the worst Lightning Storm in 12 years, during " Someday I'll be Saturday night " Jon stopped, the band kept playing, and he said;

" This song is for Phill Lynott and Elvis"

and just then a bolt of lightning ripped across the sky over the stadium,
the band stopped- the crowd stopped - and suddenly let out a roar that would have been heard around the country!

It had an amazing effect on the crowd and made the band play their hearts out, the buzz was so amazing I'm getting Goosebumps now just writing this!
Thats one special memory I have.