Oh yes, testing spells. I remember Dornstaag Greymantle wanting to show off "ghostly visage". He handed his staff over and demanded to be attacked with it. After emoting *pokes with staff* he said, "No, as hard as you can!" and then went down from a crit handily surpassing the DR... wizards

.
Counterspell is dangerous due to iniative mostly though. Even natural counters and immunity-granting spells only work if you started
casting them before the other person did. Rumour has it Aravilar also sustained some injuries during the field tests for that...