Takeover chatter is good until it's bad. 

Trading of Boston Scientific Corp. (BSX) - Get Report  shares had to be halted temporarily Monday, June 11, after reports of a takeover by Stryker Corp. (SYK) - Get Report sent the stock soaring.

The Wall Street Journal reported that Stryker made a takeover approach, sending Stryker down more than 3% and Boston Scientific up more than 6% in a matter of minutes. Stryker was already nearing its daily average trading volume of 1.3 million shares.

Boston Scientific shares were up 9.5% to $35 a share shortly after trading resumed after 10:40 a.m. ET.