1st Pfizer and, other than a sore arm for a couple of days, I had no ill effects.
2nd Pfizer and no sore arm but I was hit by a wave of tiredness about 5-6 hours afterwards which sent me straight to bed around 8 pm. That was the worst of it but the tiredness lingered for the next day or so. Talking to my neighbours, my experience matched theirs.
A colleague had no ill effects after her first Pfizer but the second gave her a feverishness that lasted a couple of days.
Then again my brother and his wife both had Pfizer and no ill effects at all.